KCNJ1 and Bartter syndrome: Bartter syndrome is caused by mutations in SLC12A1 encoding NKCC2 (type I), KCNJ1 encoding ROMK (type II), CLCNKB encoding ClC‐Kb (type III) or BSDN encoding Barttin (type IV) (OMIM: 601678, 241200, 607364 and 602522, respectively).70, 71, 72, 73, 74, 75