[1] Univ Ulsan, Coll Med, Dept Infect Dis, Asan Med Ctr, 88 Olymp Ro 43 Gil, Seoul 05505, South Korea
[2] Univ Ulsan, Coll Med, Off Infect Control, Asan Med Ctr, Seoul, South Korea
[3] Univ Ulsan, Coll Med, Dept Pediat, Asan Med Ctr, Seoul, South Korea
[4] Univ Ulsan, Coll Med, Dept Lab Med, Asan Med Ctr, Seoul, South Korea