( ( ( ( ( Three ( mood stabilizers ) ) , ) ( ( ( ( ( lithium , ) ( valproic acid ) ) , ) and ) carbamazepine ) ) , ) ( ( have ( been ( shown ( to ( ( be ( effective ( in ( ( the treatment ) ( of ( acute episodes ) ) ) ) ) ) ( -LRB- ( 26 -RRB- ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD Three) (NN mood) (NNS stabilizers)) (, ,) (NP (NP (NN lithium)) (, ,) (NP (JJ valproic) (NN acid)) (, ,) (CC and) (NP (NN carbamazepine))) (, ,)) (VP (VBP have) (VP (VBN been) (VP (VBN shown) (S (VP (TO to) (VP (VB be) (ADJP (JJ effective) (PP (IN in) (NP (NP (DT the) (NN treatment)) (PP (IN of) (NP (JJ acute) (NNS episodes)))))) (PRN (-LRB- -LRB-) (NP (CD 26)) (-RRB- -RRB-)))))))) (. .)))
Three mood stabilizers, lithium, valproic acid, and carbamazepine, have been shown to be effective in the treatment of acute episodes (26).
(ROOT (S (NP (NNP Lithium)) (VP (VBZ has) (NP (CD three) (NNS electrons))) (. .)))