Eman Alkhalawi1, Ariana Znaor2, Ali Saeed Al-Zahrani3. 1. Department of Family and Community Medicine, King Abdulaziz University, Jeddah 21589 Saudi Arabia. Electronic address: ealkhalawi@kau.edu.sa. 2. Cancer Surveillance Branch, International Agency for Research on Cancer, Lyon, France. 3. Gulf Centre for Cancer Control and Prevention, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.