Heartburn, Gastroesophageal Reflux Disease

Korea University Ansan Hospital, Ansan, South Korea

Pusan National University Hospital, Busan, South Korea

Kyungpook National University Chilgok Hospital, Chilgok, South Korea

Hallym University Chuncheon Sacred Heart Hospital, Chuncheon, South Korea

Chonnam National University Hospital, Gwangju, South Korea

Catholic University of Korea, Incheon ST. Mary's Hospital, Incheon, South Korea

Gangnam Severance Hospital, Seoul, South Korea

Kyung Hee University Hospital, Seoul, South Korea

Soonchunhyang University Hospital, Seoul, South Korea

Pusan National University Yangsan Hospital, Yangsan, South Korea