1. Clinic for Small Animals Kaiserberg Duisburg Germany
2. Unit for Biomathematics and Data Processing Justus‐Liebig University Giessen Germany
3. Reproductive Unit of the Clinics, Clinic for Small Animals University of Veterinary Medicine Hannover, Foundation Hannover Germany
4. Clinic for Obstetrics, Gynaecology and Andrology of Large and Small Animals with Veterinary Ambulance Justus‐Liebig‐University Giessen Germany