Response by Crotti et al to Letter Regarding Article, "Genetic Modifiers for the Long-QT Syndrome: How Important Is the Role of Variants in the 3′ Untranslated Region of KCNQ1?". (December 2016) - Crotti, Lia; Lahtinen, Annukka M.; Spazzolini, Carla; Mastantuono, Elisa; Cristina Monti, Maria; Morassutto, Caterina; Parati, Gianfranco; Heradien, Marshall; Goosen, Althea; Lichtner, Peter; Meitinger, Thomas; Brink, Paul A.; et al.