GSTM1 and nutritional deficiency disease: Reasons for exclusion were: opinion of the investigator (n = 9); Hb <8g/dL (n = 7); severe malnutrition (n = 4); consent withdrawn (n = 2); sample size achieved (n = 2); low platelet count (n = 1); screening to vaccination date exceeded 28 days (n = 1); ALT >45 U/L (n = 1); and participation in another trial (n = 1).