Butterfly in the esophagus: what is wrong?
Hwang
Jin Ki
JK
Department of Gastroenterology, Korea University Guro Hospital, Seoul, Korea.
Hong
Seung Goun
SG
Joo
Moon Kyung
MK
Park
Jong-Jae
JJ
Kim
Jae Seon
JS
Bak
Young-Tae
YT