CFTR and congenital bilateral aplasia of vas deferens from CFTR mutation: Hundreds of CFTR variants have been reported in CBAVD patients, with the four most common being c.1210‐12T[5], p.Phe508del, p.Met470Val, and p.Arg117His (Grangeia et al., 2004); 70%–80% CBAVD patients carry at least one CFTR variant (Yu, Chen, Ni, & Li, 2012).