1. Mahidol University, Bangkok, Thailand;
2. Faculté de Médecine, Marseille, France;
3. Banmai Chaiyapod Hospital, Bureerum Province, Thailand;
4. Maharat Nakornrachasema Hospital, Nakornrachasema Province, Thailand;
5. Loei Hospital, Loei Province, Thailand;
6. Udornthani Hospital, Udornthani Province, Thailand