The authors
A. David Weaver, BSc, Dr med vet, PhD, FRCVS, Dr hc (Warsaw), is Professor Emeritus at the University of Missouri's College of Veterinary Medicine in Columbia, Missouri, USA and formerly of the University of Glasgow, UK.

Owen Atkinson, BVSc, CertCHP, DCHP, RCVS Recognised Specialist, is Owner, Founder, and Director of Dairy Veterinary Consultancy Ltd, UK.

Guy St. Jean, DMV, MS, Dipl ACVS, is Professor of Surgery and Former Head in the Department of Veterinary Clinical Sciences at Ross University, St. Kitts, West Indies.

Adrian Steiner, Dr med vet, FVH, MS, Dr habil, Dipl ECVS, Dipl ECBHM, is Professor and Head at the Clinic for Ruminants, Vetsuisse-Faculty, University of Bern, Switzerland.