1. Sithisarankul P. Occupational versus environmental medicine: similarities and differences. Intern Med J Thai. 2003; 19:293.
2. National Statistical Office of Thailand. Working population in January 2017 survey: National Statistical Office of Thailand. [online] 2017 [cited 2017 Feb 21]. Available at http://service.nso.go.th/nso/nsopublish/themes/files/lfs60/reportJan.pdf. [in Thai]
3. Bundhukul A. Career progress for occupational medicine physicians. In: Bundhukul A, editor. Textbook of occupational medicine. Bangkok: Ratchathun Press; 2011. p. 38–72.
4. Sithisarankul P. Training in occupational medicine in Thailand. Intern Med J Thai. 2003; 19:86–7.
5. Department of Preventive and Social Medicine. Graduate diploma of clinical sciences program in occupational medicine curriculum (BE 2547). Bangkok: Chulalongkorn University; 2004. [in Thai].