1. Hilary M. Clayton, PhD, DACVSMR, MRCVS, is Mary Anne McPhail Dressage Chair in Equine Sports Medicine and Professor of Large Animal Clinical Sciences, Mary Anne McPhail Equine Performance Center, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824; claytonh@cvm.msu.edu
2. LeeAnn J. Kaiser, MS, is Laboratory Manager, Mary Anne McPhail Equine Performance Center, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing
3. Bonnie de Pue, OTR, is President, Children and Horses United in Movement (C.H.U.M.) Therapeutic Riding, Dansville, MI
4. Lana Kaiser, MD, DVM, is Professor of Nursing and Medicine, Department of Medicine, College of Human Medicine, Michigan State University, East Lansing