title: Reference limits: limited references in laboratories worldwide.
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Huang
mesh_terms: D005006:Ethnicity; D006801:Humans; D007755:Laboratories, Hospital / Q000592:standards*; D008297:Male; D011786:Quality Control; D012016:Reference Values; D015203:Reproducibility of Results; D012661:Semen / Q000502:physiology*; D014944:World Health Organization