[1] Ctr Dis Control, Res & Diagnost Ctr, Taipei, Taiwan
[2] Natl Yang Ming Univ, Sch Dent, Inst Oral Biol, Taipei 112, Taiwan
[3] Natl Taiwan Univ, Grad Inst Environm Engn, Taipei 10764, Taiwan
[4] Natl Taiwan Univ, Coll Med, Dept Internal Med, Taipei 10764, Taiwan
[5] Far E Mem Hosp, Dept Internal Med, Taipei, Taiwan
[6] Natl Chung Cheng Univ, Dept Earth & Environm Sci, Chiayi, Taiwan
[7] Changhua Christian Hosp, Dept Lab Med, Changhua, Taiwan
[8] Natl Def Med Ctr, Dept Microbiol & Immunol, Taipei, Taiwan