[1] Willows Vet Ctr & Referral Serv, Solihull, W Midlands, England
[2] Univ Liverpool, Dept Musculoskeletal Biol, Inst Aging & Chron Dis, Fac Hlth & Life Sci, Liverpool, Merseyside, England
[3] Univ Edinburgh, Div Clin Vet Sci, Royal Dick Sch Vet Studies, Edinburgh, Midlothian, Scotland
[4] Univ Edinburgh, Roslin Inst, Edinburgh, Midlothian, Scotland
[5] Cornell Univ, Coll Vet Med, Dept Clin Sci, Ithaca, NY 14853 USA
[6] ChesterGates Vet Specialists, Gates Rd, Chester CH1 6LT, Cheshire, England