[1] Natl Yang Ming Univ, Sch Med, Fac Med, Taipei 112, Taiwan
[2] Natl Yang Ming Univ, Sch Med, Inst Clin Med, Taipei 112, Taiwan
[3] Natl Yang Ming Univ, Sch Med, Inst Pharmacol, Taipei 112, Taiwan
[4] Taipei Vet Gen Hosp, Dept Med, Taipei, Taiwan
[5] Taipei Vet Gen Hosp, Dept Surg, Taipei, Taiwan
[6] Taipei Vet Gen Hosp, Dept Radiol, Taipei, Taiwan
[7] Univ Calif Los Angeles, Dept Biostat, Los Angeles, CA USA