Does propolis affect the quality of life and complications in subjects with irritable bowel syndrome (diagnosed with Rome IV criteria)? A study protocol of the randomized, double-blinded, placebo-controlled clinical trial. - Miryan, Mahsa; Alavinejad, Pezhman; Abbaspour, Mohammadreza; Soleimani, Davood; Ostadrahimi, Alireza (Trials, 2020)