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Knaapila J, Kallio H, Hakanen AJ, Syvänen K, Ettala O, Kähkönen E, Lamminen T, Seppänen M, Jambor I, Rannikko A, Riikonen J, Munukka E, Eerola E, Gunell M, Boström PJ.Knaapila J, et al. Among authors: riikonen j.BJU Int. 2018 Aug;122(2):203-210. doi: 10.1111/bju.14198. Epub 2018 Apr 6.BJU Int. 2018.PMID: 29533507Clinical Trial.