SCN4A and channelopathy: Genes associated with channelopathies (SCN4A, CACNA1S, KCNJ2, CLCN1) or congenital myasthenic syndrome and related disorders (CHRNA1, CHRNB1, CHRND, CHRNE, RAPSN, CHAT, MUSK, COLQ, DOK7, AGRN, GFPT1, DPAGT1, LAMB2, CHRNG, PLEC) were specifically checked.