Bourne JE, Sauchelli S, Perry R, Page A, Leary S, England C, Cooper AR. Health benefits of electrically-assisted cycling: a systematic review. Int J Behav Nutr Phy. 2018 Nov 21;15(1):116. doi: 10.1186/s12966-018-0751-8
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.