To evaluate anaemia by erythrocyte indices, red cell distribution width and haemoglobin electrophoresis with special reference to thalassemia in paediatric age group.
The concept of mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), and mean corpuscular hemoglobin concentration (MCHC) was first given by Wintrobe in 1929. Since then many studies have been done to classify anemia. The red blood cell indices (RBC indices) are part of a routine blood test called the complete blood count (CBC). The RBC indices measure the size, shape, and physical characteristics of the red blood cells. Along with the red blood cell count (RBC), the RBC indices are used to diagnose various forms of anemia.
A person with a low RBC and/or any abnormal RBC indices has some form of anemia. Thalassemia is a quantitative disorder of hemoglobin. Hb electrophoresis is a reliable, rapid, reproducible and easy method to separate various Hb fractions depending on their charge and these fractions are then quantitated.
MATERIALS AND METHODS: The present study was conducted in the Department of Pathology, G.S.V.M. Medical College, Kanpur, from December 2010 to September 2012. The study included 100 cases of pediatric age group (0-18 years) presenting with anemia were selected. Careful history and physical examination regarding organomegaly lymphadenopathy were elicited.
Cases showing anemia due to drugs intake, leukemia and blood loss were excluded in this study. Each case was evaluated using Hemoglobin levels, RBC indices (PCV, Red Blood Cell count and absolute values), Reticulocyte count, peripheral smear examination, bone marrow examination using Leishman stain and Hemoglobin Electrophoresis (in selected cases) was done.
OBSERVATION: In the present study 100 cases were studied showing anemia was most common in 13-18 years (45%) followed 6 to 12 year (30%). Along with these cases 50 healthy subject with similar age group were taken as control group.
The most common age group showing anemia was 13-18 yrs. (45%).
Hemoglobin & RBC Indices were found to be within the normal range for control group amongst different age groups.
DIFFERENT ANAEMIAS IDENTIFIED BY PERIPHERAL BLOOD SMEAR EXAMINATION IN DIFFERENT AGE GROUPS:
Graph 1 < 1 yr 1.5 Yr 6.12 Yr 13.18 Yr 9% 16% 30% 45% Microcytic hypochromic anemia 33.3 43.7 33.3 20 Macrocytic anemia 11.11 6.3 18.3 18.3 Dimorphic anemia 1.1 12.5 40 53.3 Haemolytic anemia 44 31.2 6.7 2.2 Normocytic normochromic anemia 0 6.3 6.7 11.1 Note: Table made from bar graph.
Dimorphic anemia was more common among the children more than 6 years of age, Microcytic hypochromic anemia was more prevalent between 1-6 years of age and Hemolytic anemia was most commonly seen in infants (<1 year).
DIFFERENT TYPES OF ANEMIA IDENTIFIED BY PERIPHERAL BLOOD SMEAR EXAMINATIONS AND ERYTHROCYTE INDICES:
Graph 2 Peripheral Blood Smear Erythrocyte Indices Microcytic 29 36 Hypochromic Macrocytic 12 18 Anemia Dimorphic 39 33 Anemia Haemolytic 12 7 Anemia Normocytic 8 6 Normochromic Anemia Note: Table made from bar graph.
The differences in values of MCV, MCH and MCHC in hemolytic and microcytic anemia are insignificant (p>0.05) while the difference in RDW values is significant (p<0.001).
Values of erythrocytic indices were showing no significant difference (p>0.05) in Megaloblastic as well as Non- Megaloblastic anemia.
Cases showing anemia due to drugs, snake bites etc. were excluded from the study, Thalassemia was the only hemolytic anemia found during study period. These observations show that out of total 12 cases Thalassemia minor were the commonest.
Difference in MCHC and RDW were significant (p<0.001) while that of MCV and MCH were insignificant (p>0.05)
RDW had highest sensitivity. Specificity was 100% with rule of JM England but sensitivity was less. Therefore it may be concluded that RDW is the best among all other laws.
HbA and HbA2 were the maximum in Thalassemia minor, HbF was the maximum in Thalassemia major
DISCUSSION: The cases having anemia were classified by peripheral blood smear examination into five major groups- Microcytic hypochromic anemia, Macrocytic anemia, Dimorphic anemia, Hemolytic and Normocytic normochromic anemia.
In the present study it was observed that the most common age group involved in anemia was 13-18 yrs (45%). Out of total 100 cases studied dimorphic anemia was more common among the children >6 years of age, microcytic hypochromic anemia was more prevalent between 1-6 years of age and hemolytic anemia was most commonly seen in infants (< 1 year).
The most common etiology for anemia in present study was nutritional deficiency. Banerjee et al (1968), Sabah et al (2010) also concluded same cause.
In the present study 50 healthy individuals of different pediatric age groups were taken as control group. The mean values of various indices were found similar to that were reported by Dacie and Lewis (1994).
By PBS examination 29 cases were of microcytic hypochromic anemia and 12 cases were of macrocytic anemia while RBC indices showed 36 cases as microcytic hypochromic and 18 cases as macrocytic anemia. Thus 7 cases of microcytic hypochromic anemia and 6 cases of macrocytic anemia were missed by PBS examination alone. Additional 7 cases, which were diagnosed as microcytic hypochromic by RBC indices, were having MCV ranging from 76 to 79 fl and MCHC 31 to 33.8 gm%. Iron studies in these cases showed that out of 7 cases, 3 cases were of early iron deficiency anemia. This suggests that assessment of MCV give important clue in early diagnosis of iron deficiency anemia. Similar findings were noted by Fairbank (1971) and England JM (1976).
a) Microcytic Hypochromic anemia: Microcytic hypochromic anemia cases showed the mean values of MCV, MCH and MCHC 68.2 [+ or -] 10.4 fl, 19.9 [+ or -] 6.2 pg and 30.2 [+ or -] 1.8 gm/dl respectively. These values were significantly lower than control group (p<0.00l). RDW was increased; mean value was 19.3 [+ or -] 3.5.
Among various causes of microcytic hypochromic picture, the common causes are - iron deficiency anemia and Thalassemia minor. In present study the MCV was decreased in both cases, mean MCV and MCI-IC values in iron deficiency anemia were 69.7 [+ or -] 9.8 fl and 29.2 [+ or -] 1.8 gm/dl, while for Thalassemia minor these were 64.6 [+ or -] 4.2 tl and 31.5 [+ or -] 1.2 gm/dl. The difference in MCV was not significant (p>0.05) while for MCHC it was significant (p<0.00l). It means that MCV cannot differentiate between these two conditions but MCHC may serve an important role for screening the population for Thalassemia minor. The similar results were reported by Johnson et al (1983) and Marti HR et al (1987).
b) Macrocytic anemia: In 18% cases MCV was >100 fl. Cases showing macrocytosis grouped into 2 broad groups i.e. megaloblastic and non- megaloblastic anemia after examining the peripheral blood smear and bone marrow aspiration smear. In present study values of MCV, MCV and MCHC in cases with megaloblastic anemia were 118.5 [+ or -] 13.4fl, 33.8 [+ or -] 3.1 pg and 32.1 [+ or -] 2.4 gm/dl. Similar values were reported by Hoffbrand V (1997), Unnikrishnan V (2008).
MCV, MCH and MCHC in non-megaloblastic anemia were 112.4 [+ or -] 12.6 fl, 32.9 [+ or -] 2.8 pg and 31.9 [+ or -] 2.1 gm/dl respectively. These values showed no significant difference (p>0.05). So these two types can't be differentiated by erythrocyte indices alone.
c) Dimorphic Anemia: Values of MCV, MCH, MCHC and RDW in dimorphic anemia cases were 80.2 [+ or -] 10.6 fl, 24.2 [+ or -] 4.4 pg, 29.7 [+ or -] 1.6 gm/dl and 20.8 [+ or -] 2.2. The diagnosis of dimorphic anemia rests on PBS examination. Erythrocyte indices were not helpful. Due to presence of dual population of cells MCV remains within normal limit or shifts slightly towards higher side if macrocytes predominate or towards lower side, if microcytes predominate. Same result was concluded by Kakkar et al (2009).
d) Normocytic Normochromic Anemia: Present study showed the values of MCV, MCH, MCHC and RDW in normocytic normochromic anemia 85.2 [+ or -] 6.1fl, 29.8 [+ or -] 3.2 pg, 32.8 [+ or -] 2.2 gm/dl and 18.2 [+ or -] 1.6 respectively. Normocytic normochromic picture is seen in disorders of diverse etiology e.g. aplastic anemia, intracorpuscular and extracorpuscular defects of RBC, collagen disorders etc. But it is not possible to trace the specific cause by erythrocyte indices.
e) Hemolytic Anemia: In hemolytic anemia values of MCV, MCH, MCHC and RDW were 74.4 [+ or -] 15.6 fl, 20.8 [+ or -] 6.1 pg, 30.3 [+ or -] 5.4 gm/dl and 14.8 [+ or -] 2.5 respectively. These data favour microcytic picture but classical picture reported with hemolytic anemia is normocytic or macrocytic. The cause of this discrepancy may be that in present study thalassemia was the major cause of hemolytic anemia.
The mean value of MCV in Thalassemia major was 65.48 [+ or -] 6.3 fl which corresponds to the values reported by Baty (1932) and Smith (1948).
Out of total 100 cases, 12 cases (12%) were suspected to have various hemoglobin disorders. Suspicion was raised by hematological findings and erythrocyte indices. As the cases showing anemia due to drugs, snake bites etc. were excluded from the study, the only hemoglobin disorder diagnosed in present study was Thalassemia.
Sunna et al (1996) and Lau et al (1997) estimated prevalence of beta - Thalassemia and found it 4.45% and 3.4% respectively. Madan N (2010) found frequency of beta thalassemia trait in India between 1-17% (average 4.5%). Indian Council of Medical Research, New Delhi (1993) found that [beta]-Thalassemia is the commonest haemoglobin disorder in India and estimated prevalence between 2.7 to 14.9% with an average of 4.5% in different regions of India. In present study prevalence of Thalassemia was 12% with maximum number of cases (7 out of 12) were Thalassemia minor constituting 58.33% among cases of [beta]-Thalassemia. No case of [alpha]-Thalassemia was found during study.
In present study cases with Thalassemia major showed mean values of HbA, HbF and [HbA.sub.2] 16.1% (3.1-53%), 80.6% (42.6-92.8%) and 4.5% (2.5-8.6%) respectively. Silvestroni et al (1968) concluded that homozygous [beta][omicron]-Thalassemia is associated with predominance of HbF with total absence of HbA and variable amount of HbA2. In present study no case showed absence of HbA so none of the cases were of homozygous [beta][omicron]- Thalassemia. Kattamis et al (1979) concluded that in individuals with homozygous [beta][omicron]-Thalassemia of Mediterranean variety and those with doubly heterozygous [beta][omicron]/[beta]+_ Thalassemia, amount of HbA are variable, HbF is increased and HbA2 is normal, decreased or elevated. The mean levels of HbA2 were 4.1 % (2.4-8.7%) and 1.8% (0.6-3.4%) in [beta]+/[beta]+ and [beta][omicron]/[beta]+ thalassemia respectively. So our study has level of HbA2 very close to [beta]+/[beta]+ thalassemia. But as such no definite criteria's are laid down till now for diagnosis or differentiation of [beta]+/[beta]+ and [beta][omicron]/[beta]+Thalassemia by levels of HbA2.
Thalassemia intermedia cases showed mean values of HbA, HbF and HbA2 77.9% (57.5-88.3%), 20% (10-30%) and 3.3% (2.6-4%) respectively. Involvement of [delta][beta]-gene usually results in fall of or total absence of HbA2. No case in our study corresponded to this level of HbA2, so most likely genotype in our study should be [beta]+/[beta]+ black or [beta][omicron]/[beta]+.
In Thalassemia minor the mean values of HbA, HbF and HbA2 were 93.6% (91.4-95.1 %), 1.6% (1.22.8%) and 5.3% (3.8-8.6%) respectively. Kunkel et al (1957) reported that in thalassemia minor hemoglobin electrophoresis demonstrates the predominance of HbA, increased level of HbA2 (3.5-8.0%) and normal or minimally increased level of HbF. Fortova et al (1995) demonstrated range of HbA2 for thalassemia minor between 6.04 [+ or -] 0.96 %. In our study the levels of HbA2 correspond well with all these reported values.
ROLE OF VARIOUS RULES AND RDW IN DIFFERENTIATION OF THALASSEMIA MINOR FROM IRON DEFICIENCY ANEMIA: Thalassemia minor poses problem in diagnosis because GBP reveals no feature of hemolysis rather it has microcytic hypochromic picture which has similarity with iron deficiency anemia. Basophilic stippling and target cells tend to be more prominent in thalassemia minor than in iron deficiency. But it is very difficult to differentiate between two by only GBP, so several decision making rules have been proposed for differentiation will be discussed here.
In present study on applying different rules on suspected cases of Thalassemia minor- JM England proved to be superior among these by having 100% specificity but sensitivity was less. Shine's rule had sensitivity of 85.7% but specificity was only 28.6%. So application of Shine's rule detected 71.4% false positive cases. Mentzer's law was having sensitivity and specificity 71.4% and 57.1 % respectively and among all other rule it was more accurate having good sensitivity and specificity both. ICSH (1978) reported that accuracy of various rules was not more than 70% to 90%.
The major cause of the inconsistence performance of these rules can be the combined presence of iron deficiency and Thalassemia minor. In iron deficiency TRBC has lesser value than thalassemia minor so rule taking MCV and TRBC both or TRBC alone in calculation has higher specificity. But in Shine's law which takes only MCV and MCH in calculation came out to be most sensitive but least specific because higher values of TRBC do not influence this rule.
RDW served the best role in differentiation between Thalassemia minor and iron deficiency anemia having high sensitivity (87.3%) and specificity (90.5%). Normal value of RDW - CV in our study was 14.3 [+ or -] 0.6. The value of RDW in Thalassemia minor and iron deficiency anemia was 14.8% [+ or -] 2.5 and 20.8% [+ or -] 3.8 respectively, showing significant difference (p<0.00l). RDW remained normal in Thalassemia minor while it was increased in iron deficiency anemia. Same findings were reported by Johnson et al (1983), Marti and Fisher (1987).
CONCLUSION: Dimorphic anemia is the commonest anemia in the study. Erythrocyte indices are more sensitive for diagnosis of Microcytic hypochromic, Normocytic normochromic and Macrocytic anemia than peripheral blood smear examination alone but can't diagnose Dimorphic and Hemolytic anemia and can't differentiate between megaloblastic and non-megaloblastic anemia. Prevalence of Thalassemia minor is the maximum among all Thalassemia. None of the indices is 100% sensitive and 100% specific. But among all indices RDW is the most reliable in differentiation of beta Thalassemia minor and Iron deficiency anemia.
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Mahendra Singh , Anuradha Gautam 
[1.] Mahendra Singh
[2.] Anuradha Gautam
PARTICULARS OF CONTRIBUTORS:
[1.] Professor & HOD, Department of Pathology, G. S. V. M Medical College, Kanpur, U. P.
[2.] Junior Resident, Department of Pathology, G. S. V. M. Medical College, Kanpur, U. P.
NAME ADDRESS EMAIL ID OF THE CORRESPONDING AUTHOR:
Dr. Anuradha Gautam, # 104/192, Sisamau, Kanpur-208012, U. P.
Date of Submission: 15/01/2015.
Date of Peer Review: 16/01/2015.
Date of Acceptance: 27/01/2015.
Date of Publishing: 03/02/2015.
Table 1: AGE INCIDENCE Age (Yrs.) No of Cases Percentage < 1 09 09 % 1-5 16 16 % 6-12 30 30 % 13-18 45 45 % Total 100 100 % Table 2: Hemoglobin, erythrocyte indices and RDW in 50 healthy subjects (control group) Hb MCV Control No of cases mean [+ or -] 2 mean [+ or -] 2S Group SD SD (fl) (gm %) < 1Year 10 12.6 [+ or -] 1.5 94.0 [+ or -] 8.0 1-5 Year 10 11.8 [+ or -] 1.5 88.8 [+ or -] 5.8 6-12 Year 15 13.5 [+ or -] 2.0 86.0 [+ or -] 9.0 13-18 Year 15 13.8 [+ or -] 1.5 92.6 [+ or -] 7.2 MCH MCHC RDW CV (%) Control mean [+ or -] 2S mean [+ or -] 2S Mean [+ or -] 2S Group SD (pg.) SD(gm/dl) SD < 1Year 32.0+3.0 33.0+4.0 14.3+0.6 1-5 Year 29.8 [+ or -] 1.6 33.8+1.2 14.3 [+ or -] 0.6 6-12 Year 29 [+ or -] 4.0 34 [+ or -] 3.0 14.5 [+ or -] 1 13-18 Year 31.2 [+ or -] 2.0 34.0 [+ or -] 1.6 14.5 [+ or -] 1 Table 3: RBC INDICES AND RDW IN DIFFERENT TYPES OF ANEMIA Type of Anemia MCV mean+2SD (fl) MCH mean [+ or -] 2SD (pg) Microcytic 68.2 [+ or -] 10.4 19.9 [+ or -] 6.2 Macrocytic 113.7 [+ or -] 12.2 33.1 [+ or -] 3.2 Dimorphic 80.2+10.6 24.2 [+ or -] 4.4 Haemolytic 74.4+15.6 20.8 [+ or -] 6.1 Normocytic normochromic 85.2 [+ or -] 6.1 29.8 [+ or -] 3.2 Type of Anemia MCHC RDW % mean [+ or -] 2SD mean [+ or -]2SD (gm %) Microcytic 30.2 [+ or -] 1.8 19.3[+ or -]3.5 Macrocytic 31.3 [+ or -] 2.2 23.2[+ or -]2.4 Dimorphic 29.7 [+ or -] 1.6 20.8[+ or -]2.2 Haemolytic 30.3 [+ or -] 5,4 14.8+2.5 Normocytic normochromic 32.8 [+ or -] 2.2 18.2[+ or -]1.6 TABLE 4: RED CELL INDICES IN DIFFERENT TYPES OF MACROCYTIC ANEMIA Types of MCV mean [+ or -] MCH mean [+ or -] 2SD fl 2SD pg. Megaloblastic 118.5 [+ or -] 13.4 33.8[+ or -]3.1 Non-Megaloblastic 112.4 [+ or -] 12.6 32.9[+ or -]2.8 Types of MCHC mean [+ or -] 2SD Megaloblastic 32.1 [+ or -] 2.4 Non-Megaloblastic 31.9 [+ or -] 2.1 TABLE 5: Hemolytic anaemias identified by peripheral blood smear examination, clinical picture and hemoglobin electrophoresis Type of Anemia No.of Cases Percentage of total Thalassemia Cases Thalassemia Major 3 25.0 % Thalassemia Intermedia 2 16.67 % Thalassemia Minor 7 58.33 % Total 12 100 % Table 6: Erythrocyte indices and RDW in thalassemia minor and iron deficiency anemia Type of Anemia MCV mean [+ or -] 2SD MCH mean [+ or -] (fl) 2SD (pGg) Thalassemia 64.6 [+ or -] 4.2 20.1+2.4 Iron Deficiency Anemia 69.7 [+ or -] 9.8 18.9 [+ or -] 2.88 Type of Anemia MCHC mean [+ or -] RDW mean [+ or -] 2SD (gm/dl) 2SD (%) Thalassemia 31.5 [+ or -] 1.2 14.8 [+ or -] Iron Deficiency Anemia 29.2 [+ or -] 1.8 20.8 [+ or -] 3.8 Table 7: Sensitivity, specificity, false positive and false negative values of various rules and RDW for diagnosing thalassemia minor in microcytic hypochromic anemia having no feature of hemolytic anemia in peripheral blood smear. Various Rules Sensitivity (%) Specificity (%) JM England 57.1 100 WC Mentzer 71.4 57.1 I Shine 85.7 2.6 RDW 87.3 90.5 Various Rules False Positive (%) False Negative (%) JM England 0 42.9 WC Mentzer 42.9 28.5 I Shine 71.4 14.3 RDW 9.5 12.7 Table 8: Mean and range of various haemoglobins in different hemoglobin disorders Hb. Disorders Normal Hb HbA Hb[A.sub.2] HbF mean/ range mean/ range mean/ range 16.1 4.5 80.6 Thalassemia major (3.1-53) (2.5-8.6) (42.6-92.8) Thalassemia 77.9 3.3 20.0 Intermedia (57.5-88.4) (2.6-10.4) (10-30) Thalassemia minor 93.6 5.3 1.6 (91.4-95.1) (3.8-8.6) (1.2-2.8) Hb. Disorders Variants HbE HbS mean/ range mean/ range -- -- Thalassemia major Thalassemia -- -- Intermedia Thalassemia minor -- --
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|Title Annotation:||ORIGINAL ARTICLE|
|Author:||Singh, Mahendra; Gautam, Anuradha|
|Publication:||Journal of Evolution of Medical and Dental Sciences|
|Date:||Feb 5, 2015|
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