1. Department of Social Medicine Zanjan University of Medical Sciences Zanjan Iran
2. Gastrointestinal and Liver Diseases Research Center Iran University of Medical Sciences Tehran Iran
3. Department of Cardiology Iran University of Medical Sciences Tehran Iran
4. Department of Pulmonology, Firouzgar Hospital Iran University of Medical Sciences Tehran Iran
5. Faculty of Science Engineering and Computing, Kingston University Kingston UK
6. Cancer Theme SEC Faculty Kingston University London UK