CNTN1 and chronic inflammatory demyelinating polyradiculoneuropathy: Interestingly, thirteen of the patients with co‐morbid CIDP and membranous nephropathy were consistently found to be positive to anti‐CNTN1 antibodies,15, 16, 17, 18, 19, 20, 21, 22, 33 while two cases with anti‐NF186 antibodies were reported to present with acute‐onset CIDP and focal segmental glomerulosclerosis (FSGS).34