1. a Cancer Control Office, King Hussein Cancer Center, Amman, Jordan
2. b Independent Tobacco Control & Tobacco Dependence Treatment Consultant (private practice), King Hussein Cancer Center, Amman, Jordan
3. c Department of Internal Medicine, King Hussein Cancer Center, Amman, Jordan
4. d School of Medicine, University of New Mexico, Albuquerque, New Mexico, USA
5. e Respiratory Therapy Services, King Hussein Cancer Center, Amman, Jordan
6. f College of Pharmacy, University of Houston, Houston, Texas, USA
7. g Section of Pulmonary and Critical Care, Department of Medicine, King Hussein Cancer Center, Amman, Jordan