(S (S (NP (BASENP (DT A) (JJ robotic) (NN system)) (PP (IN at) (BASENP (NNP Stanford) (NNP Medical) (NNP Center)))) (VP (VBD was) (VP (VP (VP (VBN used) (S (VP (TO to) (VP (VB perform) (BASENP (DT a) (JJ laparoscopic) (JJ gastric) (NN bypass) (NN surgery)))))) (ADVP (RB successfully))) (PP (IN with) (NP (BASENP (DT a) (ADJP (RB theoretically) (JJ similar)) (NN rate)) (PP (IN of) (NP (BASENP (NNS complications)) (PP (TO to) (NP (BASENP (DT that)) (VP (VBN seen) (PP (IN in) (BASENP (JJ standard) (NNS operations))))))))))))) (PERIOD .))