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Ahn, Chiwon, Changsun Kim, Bo Seung Kang, Hyuk Joong Choi, ja Jun Hwi Cho. "Variation of Availability and Frequency of Emergency Physician-performed Ultrasonography between Adult and Pediatric Patients in the Academic Emergency Department in Korea." Clin Exp Emerg Med 2015.

Ahn, Chiwon, et al. "Variation of Availability and Frequency of Emergency Physician-performed Ultrasonography between Adult and Pediatric Patients in the Academic Emergency Department in Korea." Clin Exp Emerg Med 2015.