At recruitment the Fieldworker will explain to the family the purpose of the study, the benefits offered and the procedures involved. An information sheet with the details of the study objectives, procedures, risk and benefits will also be given to the parents. Informed consent will then be obtained from both the mother and father of the child: finger prints and signature (literacy rate estimated at <50%) will be obtained in the presence of two witnesses, one a friend or family member and one the second Fieldworker.