1. Department of Ophthalmology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
2. Department of Ophthalmology, Bhumibol Adulyadej Hospital, Bangkok, Thailand
3. Ophthalmology Service, Mettapracharak (Wat Rai Khing) Hospital, Nakhon Pathom, Thailand
4. Department of Ophthalmology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
5. Department of Ophthalmology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
6. Ophthalmology Department, King Chulalongkorn Memorial Hospital, Bangkok, Thailand
7. Department of Ophthalmology, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand