We thank our colleagues Mr.Abdullah Rababah for assistance with data collection and Mr.Mohamad Salman,Specialist in Biostatistics,for assistance in data analysis.Also,we would like to extend our sincere gratitude to Dr.Santhi Appavu who provided insight and scientific guidance for this research.We acknowledge the research center at King Fahad Medical City for the grant and scientific editing services for the study.The study was supported by a grant from the research center at King Fahad Medical City under RFA: 018-010 and this didn't influence the results of the study. （）