1. 1) Deeb ZE and Einhorn KH : Infectious adult croup. Laryngoscope 100: 455–457, 1990.
2. 2) Tong MC, Chu MC, Leighton SE, et al. : Adult croup. Chest 109: 1659–1662, 1996.
3. 3) Woo PC, Young K, Tsang KW, et al. : Adult croup: a rare but more severe condition. Respiration 67: 684–688, 2000.
4. 4) Kozielski J, Szurkowska J, Jarosz W, et al. : Adult croup—a case report. Monaldi Arch Chest Dis 59: 81–83, 2003.
5. 5) Nakayama JM and Tokeshai J : A case report of adult croup: a new old problem. Hawaii Med J 64: 246–247, 2005.