Ethics approval and consent to participate
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committees and with the 1964 Helsinki declaration and its later amendments (subjects read and signed a dedicated consent form). Ethics committee approval numbers of the Institutional Board are: ID 11-58-12 for the Committee on Human Rights Related to Research Involving Human Subjects, Faculty of Medicine Ramathibodi Hospital, Mahidol University; 60117 for the Ethics Committee on Researches involving Human, Rajavithi Hospital; and Q031h/60 for the Institutional Review Board, Royal Thai Army Medical Department (for Phramongkutklao Hospital).