[1] Tri Serv Gen Hosp, Dept Internal Med, Div Infect Dis & Trop Med, Natl Def Med Ctr, Taipei 114, Taiwan
[2] Taipei Vet Gen Hosp, Dept Med, Infect Dis Sect, Taipei, Taiwan
[3] Natl Hlth Res Inst, Div Clin Res, Taipei, Taiwan
[4] Natl Yang Ming Univ, Taipei 112, Taiwan