1 Alliance for International Medical Action (ALIMA), Paris 75011, France; Alliance for International Medical Action (ALIMA), Dakar, Senegal; Global Child Health, Witten/Herdecke University, Witten, Germany. Electronic address: hansjoerg.lang@alima.ngo.
2 Biomedical Department, University of Edinburgh, Edinburgh, UK.
3 Partners in Health, Freetown, Sierra Leone.
4 Alliance for International Medical Action (ALIMA), Dakar, Senegal.