The present study involved human beings and the data collected are personal. In the protocol approved by both ethics board, there is nothing stating that the data will be made publicly available. In the case of Vietnam the data are owned by the country and permission from the Ministry of Health is required for free and public access to the data. Furthermore, in the information letter given to each partipants it is stated: " The information you provide will not be divulged: only the people involved in this survey will have access to the information collected, anonymously. " In Burkina Faso the person to contact to get access to the data is: Mr Yves Gérard Bazié, Head of the Studies, Forecasting and Policy Department at the Permanent Secretariat for Agricultural Sector Policies, Ouaggadougou, Burkina Faso. Mr Bazié was responsible for submitting the protocole to the ethic committee in Burkina Faso and guaranteed that the data collection followed the protocol submitted to the ethics committee. His contact is: sevy_baz@yahoo.fr In Vietnam the person to contact to get access to the data is: Huynh Nam Phuong from the National Institute of Nutrition, based in Hanoi, Vietnam. Huynh Nam Phuong is the Head of Science Management Section of National Institute of Nutrition and she was involved in data management.