RT Journal Article SR Electronic T1 Achalasia with megaesophagus JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E684 OP E684 DO 10.1503/cmaj.230111 VO 195 IS 19 A1 Yang, Chew Fatt A1 Chua, Chun YR 2023 UL http://www.cmaj.ca/content/195/19/E684.abstract