Household heads within each stratum will be invited to meetings at which random numbers will be allocated to each household. The numbers on raffle tickets will then be dropped into a rotating barrel and mixed up thoroughly in the view of all after which the barrel will be rotated. A child will be invited to pick the papers which will be allocated to intervention or control as they are drawn, alternately. Those in the intervention group will have pre-payment made for year one; the others will have it in year 2. After each draw the barrel will be rotated once more. This process will be used to make the trial more acceptable to community members by showing them the lack of favouritism and randomness of the allocation (Adapted from [43]. Since registration would have closed for the year, households will not be able to change their group until the study ends.