1. Department of Pulmonary Medicine and Critical Care, Maharaj Nakhon Si Thammarat Hospital, Thasala District, Nakhon Si Thammarat, Thailand
2. Medical Technology, Walailak University, Thasala District, Nakhon Si Thammarat, Thailand
3. Department of Physical Therapy, Maharaj Nakhon Si Thammarat Hospital, Thasala District, Nakhon Si Thammarat, Thailand