1. Faculty of Nursing and Midwifery, Kurdistan University of Medical Sciences, Sanandaj, Iran
2. School of Nursing and Midwifery, Geriatric Care Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
3. Laughter Yoga International, Mumbai, India
4. Department of Community Medicine, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran