3054027 LQTS long QT syndrome 2083 3054028 LQTS long QT interval syndrome 4 3054029 LQTS LQT syndrome 2 3054035 LQTS autoimmune-long-QT-syndrome 1 3054033 LQTS linear quantitative similarity 1 3054034 LQTS long QT syndrome patients 1 3054030 LQTS LQTS and control groups 1 3054031 LQTS LQTS only 1 3054032 LQTS prolonged Q-T interval syndrome 1