JOURNAL OF CLINICAL EPIDEMIOLOGY Forss, M, Guyatt, G H, Bolsunovskyi, K, Kilpeläinen, T P, Lee, Y, Sairanen, J, Tikkinen, K A O, Hydrocele Survey Investigators & Sander, L 2023, ' Response rates in email vs. mail surveys for urologists : a randomized controlled trial ', Journal of Clinical Epidemiology, vol. 156, pp. 123-124 . https://doi.org/10.1016/j.jclinepi.2023.01.004