1. Department of Public Health, College of Health Science Arsi University, Asella, Ethiopia
2. PhD student at School of Public Health, College of Health Science, Addis Ababa University, Addis Ababa, Ethiopia
3. Clinical Oncologist, College of Health Science, Addis Ababa University, Addis Ababa, Ethiopia
4. Department of Nursing, College of Health Science Arsi University, Asella, Ethiopia
5. Environment and Lifestyle Epidemiology, Branch International Agency for Research on Cancer, Lyon, France
6. Department of preventive Medicine, School of Public Health Addis Ababa University, Ethiopia