Efficacy and safety of a hexanic extract of Serenoa repens (Permixon®) for the treatment of lower urinary tract symptoms associated with benign prostatic hyperplasia (LUTS/BPH): systematic review and meta‐analysis of randomised controlled trials and observational studies - Vela‐Navarrete, Remigio; Alcaraz, Antonio; Rodríguez‐Antolín, Alfredo; Miñana López, Bernardino; Fernández‐Gómez, Jesús M.; Angulo, Javier C.; Castro Díaz, David; Romero‐Otero, Javier; Brenes, Francisco J.; Carballido, Joaquín; Molero García, José Mª; Fernández‐Pro Ledesma, Antonio; et al. (BJU International, 2018)