1. Division of Nursing Science, Faculty of Nursing, Chiang Mai University, Chiang Mai, Thailand.
2. Department of Biobehavioral Nursing and Health Systems, School of Nursing, University of Washington, Seattle, Washington.
3. Department of Surgery, University of Washington, Seattle, Washington.
4. Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, Washington.
5. Department of Psychosocial Nursing and Community Health, School of Nursing, University of Washington, Seattle, Washington.