1. Warren House Farm, Equine Fertility Clinic, Brownhills WS8 6LU, West Midlands, UK
2. Departamento de Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, 46115 Alfara del Patriarca, Spain
3. Sharjah Equine Hospital, Sharjah 61313, United Arab Emirates
4. The Paul Mellon Laboratory of Equine Reproduction, “Brunswick”, Newmarket CB8 9BJ, Suffolk, UK