1. Korea Tourism Organization. Yearly tourism statistics of Republic of Korea. http://kto.visitkorea.or.kr/viewer/view.kto?id=61537&type=bd Assessed; Jan. 15 2020.
2. Rayman RB, Davenport ED, Dominguez-Mompell R, Gitlow S, Hastings JD, et al. Clinical aviation medicine, 5th ed. New York: Castle Connolly Graduate Medical Publishing, LLC; 2013.
3. AsMA Medical Guidelines for Air Travel: Stresses of Flight
4. Stroud MA, Belyavin AJ, Farmer EW, Sowood PJ. Physiological and psychological effects of 24-hour exposure to a low humidity environment. Farnborough (UK): Royal Air Force Institute of Aviation Medicine; May 1992. IAM report no 705.
5. Principles and Practice of Travel Medicine