ATP8B1 and hyperinsulinemic hypoglycemia, familial, 4: Fourteen variants were described earlier; three of these variants (p.Y500H, p.E665X, p.A1208fs) are associated with the progressive form of ATP8B1 deficiency and six with the episodic form (p.N45T, p.H78Q, p.D70N, p.E429A, p.I577V, p.M674T).