(S (S (BASENP (NNS Doctors)) (VP (VBP are) (VP (ADVP (RB currently)) (VP (VBG investigating) (NP (BASENP (DT some) (NNP Calgary) (NNS residents)) (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (MD could) (VP (VB be) (NP (BASENP (NN one)) (PP (IN of) (NP (NP (BASENP (DT the) (JJ first) (JJ Canadian) (NNS reports)) (PP (IN of) (BASENP (NNP MRSA)))) (PP (IN outside) (PP (IN of) (BASENP (DT a) (NN hospital) (NN setting)))))))))))))))) (PERIOD .))