title: [Observational research is an important accompaniment to randomized and controlled clinical studies].
authors.affiliation: Worldwide Health Econimic & Outcomes Research, Bristol Myers Squibb, Wheelock Square 1717 West nanjing Road, Shanghai 200040, P.R, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Lai
authors.initials: L
authors.lastname: Wei
authors.forename: Jidong
authors.initials: J
authors.lastname: Jia
authors.forename: Junqi
authors.initials: J
authors.lastname: Niu
authors.forename: Huiying
authors.initials: H
authors.lastname: Rao
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Zheng
mesh_terms: D018849:Controlled Clinical Trials as Topic; D006801:Humans; D016032:Randomized Controlled Trials as Topic