Christensen T, Riis AH, Hatch EE, Wise LA, Nielsen MG, Rothman KJ, Toft Sorensen H, Mikkelsen EM. Costs and efficiency of online and offline recruitment methods: a web-based cohort study. J Med Internet Res. 2017 Mar 1;19(3):e58. doi: 10.2196/jmir.6716
DiBenedetti DB, Gondek K, Sagnier PP, Kubin M, Keininger D, Marquis P. The treatment satisfaction scale: a multidimensional instrument for the assessment of treatment satisfaction for erectile dysfunction patients and their partners. Eur Urol. 2005 Sep 1;48(3):503-11.
Overland GB, Vatten L, Rhodes T, DeMuro C, Jacobsen G, Vada K, Angelsen A, Girman CJ. Lower urinary tract symptoms, prostate volume and uroflow in Norwegian community men. Eur Urol. 2001 Jan 1;39(1):36-41.