(S (S (SBAR (IN Whether) (S (BASENP (DT this) (NN correlation)) (VP (VB be) (VP (VBN attributed) (PP (PP (TO to) (NP (BASENP (NN nature)) (PP (IN through) (NP (BASENP (DT the) (JJ prenatal) (NNS effects)) (PP (IN of) (BASENP (DT the) (NN womb))))))) (CC or) (PP (TO to) (NP (BASENP (NN nurture)) (PP (IN through) (NP (BASENP (DT the) (JJ psychosocial) (NNS effects)) (PP (IN of) (S (VP (VP (VBG growing) (PRT (RP up))) (PP (IN with) (BASENP (JJ elder) (NNS siblings))))))))))))))) (COMMA ,) (VP (ADVP (RB however)) (COMMA ,) (VP (VBD remained) (ADJP (JJ unclear))))) (PERIOD .))