1. Department of Parasitology, Research Institute for Tropical Medicine, Muntinlupa, Philippines;
2. Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom;
3. Molecular Biology Laboratory, Research Institute for Tropical Medicine, Muntinlupa, Philippines;
4. Department of Health, MIMAROPA Center for Health Development, Quirino Memorial Medical Center Compound, Quezon, Philippines