(SINV (SINV (QT (DQL ``) (QTC (S (BASENP (DT A) (NN meta-analysis)) (VP (ADVP (RB essentially)) (VP (VBZ tells) (SBAR (INTJ (QT (DQL `) (INTJ (UH yes)) (DQR ')) (CC or) (QT (DQL `) (INTJ (UH no)) (DQR '))) (COLON --) (SBAR (IN that) (S (BASENP (DT a) (NN treatment)) (VP (VP (VP (MD does)) (CC or) (VP (VBZ does) (RB not))) (VP (VB have) (BASENP (DT a) (JJ significant) (NN effect)))))))))) (COMMA ,)) (DQR '')) (SINV (VP (VBZ says)) (NP (NP (BASENP (NNP Richard) (NNP Wurtman)) (PP (IN of) (BASENP (NNP MIT)))) (COMMA ,) (NP (BASENP (DT the) (NN study) (POS 's)) (BASENP (JJ principal) (NN investigator)))))) (PERIOD .))