title: [Occult lymph node metastasis in the middle and lower third rectal cancer after neoadjuvant radiotherapy].
authors.affiliation: Department of Gastrointestinal Surgery II, Peking University, Beijing 100142, China.
authors.forename: Hong-wei
authors.initials: HW
authors.lastname: Wang
authors.forename: Yun-feng
authors.initials: YF
authors.lastname: Yao
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Jin
authors.initials: J
authors.lastname: Gu