1. 1Department of Tropical Medicine and Malaria, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan;
2. 2Department of Parasitology, College of Public Health, University of the Philippines Manila, Manila, The Philippines;
3. 3Pilipinas Shell Foundation, Inc., Puerto Princesa, The Philippines;
4. 4Department of Community and Global Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan