1. Department of Tropical Medicine and Malaria, Research Institute, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan
2. Department of Parasitology, College of Public Health, University of the Philippines Manila, 625 Pedro Gil Street, Ermita Manila, Philippines
3. Pilipinas Shell Foundation, Inc., Puerto Princesa City, Palawan 5300, Philippines
4. Department of Community and Global Health, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan