“…However, little is known concerning the long-term post-procedural outcome of the patients, especially with regard to restenosis and clinical events. Although former studies have tried to find prognostic factors in various follow-up periods, 14,[19][20][21][22][23] few studies have accomplished a prospective and repetitive follow-up for more than 5 years. 24 Population size, patient age distribution, and commissurotomy technique (single or double balloon) should also be considered for the fair assessment of these results.…”