(S (S (PP (IN As) (BASENP (DT a) (NN result))) (COMMA ,) (S (BASENP (JJ many) (NN heart) (NNS conditions)) (VP (ADVP (RB now)) (VP (VP (VBP go) (ADJP (JJ undiagnosed))) (COMMA ,) (PP (ADVP (RB especially)) (PP (IN in) (NP (BASENP (NNS children) (CC and) (NNS others)) (SBAR (WHNP (WP who)) (S (ADVP (RB rarely)) (VP (VBP undergo) (BASENP (DT an) (NN ECG) (NN procedure)))))))))))) (PERIOD .))