1. Which of the following are electronic information sites? A Medline B EMBASE C ERIC D NRES E Omni.

1. Which of the following are electronic information sites? A Medline B EMBASE C ERIC D NRES E Omni. 2. Types of research study A Observational B Case–control 8: SURGICAL AUDIT AND RESEARCH 91 C Cross-sectional D Longitudinal E Randomised F Randomised controlled 3. Two randomly allocated treatments are compared. 4. Series of patients with a particular disease or condition are compared with matched control patients. 5. A condition or treatment is evaluated in a defined population. This study can either be prospective or retrospective.