title: Sperm crisis: what crisis?
authors.affiliation: Centre of Reproductive Medicine and Andrology, University of Münster, Münster, Germany. Eberhard.Nieschlag@ukmuenster.de
authors.forename: Eberhard
authors.initials: E
authors.lastname: Nieschlag
authors.forename: Alexander
authors.initials: A
authors.lastname: Lerchl
mesh_terms: D006801:Humans; D008297:Male; D009845:Oligospermia / Q000453:epidemiology / Q000209:etiology; D013076:Sperm Count / Q000379:methods / Q000592:standards / Q000706:statistics & numerical data; D014944:World Health Organization