1 1 Associate Professor, Faculty of Nursing, Chiang Mai University, Thailand Centre for Evidence Based Nursing and Midwifery. Contact: Phone: (66)-53-949077 Email: patrapor@mail.nurse.cmu.ac.th 2 student, Faculty of Nursing, Chiang Mai University, Thailand. Contact: Phone: (66)-81-8545551 Email: srikhachin_p@windowslive.com 3 student, Faculty of Nursing, Chiang Mai University, Thailand. Contact: Phone: (66)-81-4970863 Email: j_winapa@hotmail.com 4 student, Faculty of Nursing, Chiang Mai University, Thailand. Contact: Phone: (66)-85-4564159 Email: surachai_bcnn@hotmail.com.