1. Yoo HJ. The characteristics of elderly patients. In: Yoo HJ, editor. Geriatric medicine. Seoul: Seoul National University Press; 1998. p. 67-72.
2. Yoo HJ. What is geriatric disease? J Korean Geriatr Soc 2008;12:61-67.
3. Rhee JA, Yoo HJ. Health status of elderly Koreans. In: Choi SJ, editor. Aging in Korea: today and tomorrow. 3rd ed. Seoul: Elderly Information Center; 2013. p. 52-66.
4. Goodwin JS. Geriatrics and the limits of modern medicine. N Engl J Med 1999;340:1283-1285.
5. Yoo HJ. Korean Geriatrics Society. An introduction to geriatrics. Geriatrics. 2nd ed. Seoul: Medical Publishing; 2005. p. 22-25.
6. Olde Rikkert MG, Rigaud AS, van Hoeyweghen RJ, de Graaf J. Geriatric syndromes: medical misnomer or progress in geriatrics? Neth J Med 2003;61:83-87.
7. Toba K. Geriatric syndrome. In: Toba K, editor. How to treat for the geriatric syndrome. 1st ed. Tokyo: Medical View; 2005. p. 2-6.
8. Yoo HJ. Geriatric syndromes: a core geriatric concept. J Korean Geriatr Soc 2009;13(S2):15-19.
9. Yoo HJ. Geriatric syndromes: a geriatric characteristic. Korean J Med 2009;77(S4):1073-1076.
10. Ferrucci L, Studenski S. Clinical problems of aging. In: Harrison TR, Wiener CM, Brown CD, Hemnes AR, editor. Harrison's principles of internal medicine. 18th ed. New York: McGraw Hill; 2012. p. 579-581.
11. Won CW, Yoo HJ, Yu SH, Kim CO, Dumlao LC, Dewiasty E, Rowland J, Chang HH, Wang J, Akishita M, Tan TL, Lum C, Prakash O. Lists of geriatric syndromes in the Asian-Pacific geriatric societies. Eur Geriatr Med 2013;4:335-338.
12. Elsawy B, Higgins KE. The geriatric assessment. Am Fam Physician 2011;83:48-56.
14. Kane RL, Shamliyan T, Talley K, Pacala J. The association between geriatric syndromes and survival. J Am Geriatr Soc 2012;60:896-904.
15. Yoo HJ. Treatment of geriatric syndromes. J Korean Geriatr Soc 2010;14(S3):78-80.
16. Champion A. Anorexia of aging. Ann Longterm Care 2011;19:18-24.
18. Yoo HJ. Fall in the elderly. Korean Orthopedic Association. Orthopedics. 7th ed. Seoul: Korean Orthopedic Association; 2013. p. 1699-1702.
19. Hanley A, Silke C, Murphy J. Community-based health efforts for the prevention of falls in the elderly. Clin Interv Aging 2011;6:19-25.
20. Phelan EA, Vig EK, Abrass IB. Some considerations regarding geriatric syndromes. Ann Intern Med 2001;135:1095.
21. Kudo H, Kudo H, Watanabe M, Kodama H, Izumo Y, Sasaki H. A new approach for geriatric syndrome. Nihon Ronen Igakkai Zasshi 2008;45:18-21.
22. Strandberg TE, Pitkala KH, Tilvis RS, O'Neill D, Erkinjuntti TJ. Geriatric syndromes: vascular disorders? Ann Med 2013;45:265-273.