CFTR and chronic rhinosinusitis: For example, mild/variable CFTR mutations are present in ∼30% of individuals with recurrent idiopathic pancreatitis [37], [38], and similar associations have been established in congenital bilateral absence of the vas deferens [39], allergic bronchopulmonary aspergillosis [40], [41], chronic sinusitis [42], and idiopathic bronchiectasis [43], [44].