(S (S (NP (PP (IN Of) (NP (BASENP (DT those)) (SBAR (WHNP (WP who)) (S (VP (VBD had) (VP (VP (VBN experienced) (NP (BASENP (DT a) (NN reduction)) (PP (IN in) (BASENP (JJ depressive) (NNS symptoms))))) (PP (IN within) (NP (BASENP (NN twelve) (NNS weeks)) (PP (IN of) (BASENP (NN treatment))))))))))) (COMMA ,) (BASENP (NN ten) (NN percent))) (VP (VP (VBD went) (PRT (RP on))) (S (VP (TO to) (VP (VB have) (BASENP (NN drug) (NN abuse) (NNS problems))))))) (PERIOD .))