Affiliation: | (1) Department of Paediatric Medicine, P.G. Kar Medical College, 1 Belgachia Road, 700 004 Calcutta;(2) Department of Biochemistry, P.G. Kar Medical College, 1 Belgachia Road, 700 004 Calcutta;(3) Dept. of Pathology (Haematology Section), Calcutta National Medical College, 700 017 Calcutta |