MSH6 and atrial fibrillation: MSH6, c.3261_3262insC, p.F1088Lfs*5, AF:10.9%; MSH6, c.206C>A, p.A69E, AF:14.9%; MSH6, c.1688C>T, p.T563I, AF:12.8%; PMS2, c.1451C>A, p.P484H, AF:15.4%; MSH2, c.1597C>A, p.L533I, AF:13.9%