Leon CM, Aizpurua E. Hidden Practices Remain Hidden? Lessons from a Failed Attempt to Measure Purchasing Sexual Services Using the Item Count Technique. SRM [Internet]. 2026 Oct. 26 [cited 2026 Oct. 29];20(3):383-90. Available from: https://ojs.ub.uni-konstanz.de/srm/article/view/8532