Massive barium sulfate aspiration during upper gastrointestinal contrast material study in an elderly patient with dysphagia - Yun, Hae Ryong; Kim, Chang-gon; Park, Jihye; Park, Yong eun; lee, Yong-il; Yoo, Byung-Woo; Chung, Kyung Soo; Kim, Young Sam; Song, Joo Han (Yeungnam University journal of medicine, 2016)