title: Missing data or not?
authors.affiliation: Seoul, Korea.
authors.forename: Jeonghyun
authors.initials: J
authors.lastname: Kang
authors.forename: Kang Young
authors.initials: KY
authors.lastname: Lee
mesh_terms: D000230:Adenocarcinoma / Q000601:surgery*; D006801:Humans; D017063:Outcome Assessment, Health Care / Q000592:standards*; D012004:Rectal Neoplasms / Q000601:surgery*