Neogi, D KHazra, S C1999-09-012009-06-011999-09-012009-06-011999-09-01Neogi DK, Hazra SC. HBsAg positivity among different high risk groups and low risk group individuals in Calcutta. Journal of Communicable Diseases. 1999 Sep; 31(3): 199-200http://imsear.searo.who.int/handle/123456789/111843engHepatitis B Surface Antigens --analysisHumansRiskHBsAg positivity among different high risk groups and low risk group individuals in Calcutta.Journal Article