1. Department of General Internal Medicine, Sunrise Japan Hospital Phnom Penh, Phnom Penh, Cambodia.
2. Department of Pediatrics, Sunrise Japan Hospital Phnom Penh, Phnom Penh, Cambodia.
3. Department of Neurosurgery, Sunrise Japan Hospital Phnom Penh, Phnom Penh, Cambodia.
4. Department of Neurosurgery, Kitahara International Hospital, Tokyo, Japan.
5. Department of Internal Medicine, Soma Central Hospital, Fukushima, Japan.
6. Department of Medicine, University of Puthisastra, Phnom Penh, Cambodia.