“…In contrast, the majority of the few male patients in the idiopathic gallstone group with cholecystectomy had black or dark colour stones, and the patients without cholecystectomy classed as idiopathic gallstone disease had an equal gender distribution. We therefore conclude that adolescent female patients with complicated gallstone disease and yellowish gallstones are a patient group with adult type of idiopathic gallstone disease [13,14] , as opposed to the remaining patients who may have diverse etiologies, as previously described [15,16] . Patients < 2 years of age (17.3%) were examined as a separate group, because in most cases their conditions had been requiring medical care since birth.…”