A cross-sectional study was performed in Tanta University Hospitals, which has 1962 beds providing secondary and tertiary healthcare services to 559 532 patients per year. The total number of working physicians is 2138 (8). The study subjects were physicians working at Tanta University Hospitals based on the following inclusion criteria: residents, demonstrators, and assistant lecturers working at different departments of Tanta University Hospitals. Exclusion criteria included: physicians who spent < 3 months in the job, and those who were on vacation during the whole period of study. The sample size was calculated using Epi info 7, software developed by Center for Disease Control &