(1) Faculty of Medicine, Universitas Riau, Pekanbaru, Indonesia., Indonesia,
(2) Faculty of Medicine, Universitas Riau, Pekanbaru, Indonesia., Indonesia,
(3) Faculty of Medicine, Universitas Riau, Pekanbaru, Indonesia., Indonesia,
(4) Faculty of Medicine, Universitas Riau, Pekanbaru, Indonesia., Indonesia,
(5) Faculty of Medicine, Universitas Riau, Pekanbaru, Indonesia., Indonesia,
(6) Department of Pulmonology and Respiratory Medicine, Faculty of Medicine, Universitas Riau/Arifin Achmad General Hospital, Pekanbaru, Indonesia., Indonesia,
(7) Epidemiology Unit, Prince Songkla University, Hat Yai District, Songkhla, Thailand., Thailand