1. Genetic Analysis Department, Laboratory of Racing Chemistry, 1731-2 Tsurutamachi, Utsunomiya 320-0851, Tochigi, Japan
2. Graduate School of Veterinary Sciences, Iwate University, 3-18-8 Ueda, Morioka 020-8550, Iwate, Japan
3. Drug Analysis Department, Laboratory of Racing Chemistry, 1731-2 Tsurutamachi, Utsunomiya 320-0851, Tochigi, Japan