this supplement was made possible by the generous support of the american people through the support of the office of health , infectious diseases , and nutrition , bureau for global health , u.s . agency for international development ( usaid ) , under the terms of grant number ghag000600002 to the global alliance for improved nutrition ( gain ) and by the bill and melinda gates foundation . the contents are the responsibility of gain and do not necessarily reflect the views of usaid , the united states government or the bill and melinda gates foundation .