4. Describe the coverings of anterior abdominal wall and their corresponding layers in the scrotum and coverings of testis. (6%)

9. Please explain how to evaluate the performance of a screening instrument in terms of accuracy, using (a) a binary cut-off point; and (b) considering all possible cut-off points (i.e., overall performance). If some indexes are mentioned, please explain their meaning. (10%)

4. Describe the coverings of anterior abdominal wall and their corresponding layers in the scrotum and coverings of testis. (6%)

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