title: A Study of Native Species of Male Toads as Test Animals in the Diagnosis of Early Human Pregnancy.
authors.forename: P F
authors.initials: PF
authors.lastname: McCallin
authors.forename: R W
authors.initials: RW
authors.lastname: Whitehead
mesh_terms: D000818:Animals; D002025:Bufonidae; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy / Q000175:diagnosis