[1] Taipei Vet Gen Hosp, Dept Med Res & Educ, Taipei 112, Taiwan
[2] Natl Yang Ming Univ, Inst Microbiol & Immunol, Taipei 112, Taiwan
[3] Natl Yang Ming Univ, Inst Publ Hlth, Taipei 112, Taiwan
[4] Natl Hlth Res Inst, Dept Intramural Res Affairs, Taipei, Taiwan
[5] Natl Hlth Res Inst, Div Mol & Gen Med, Taipei, Taiwan
[6] Chang Gung Mem Hosp, Dept Pathol, Taipei 10591, Taiwan