[Whoever demands has to provide proof].
Boissevain
Laira
L
D000818:Animals; D006801:Humans; D007886:Legislation, Veterinary; D009426:Netherlands; D011817:Rabbits; D014611:Vaccination / Q000662:veterinary*; D018634:Veterinarians / Q000523:psychology*; D014730:Veterinary Medicine / Q000592:standards*