At the end of operation , the level of serumS-100beta protein was ( 0.186 + / - 0.027 ) microg/L in group A , the levels were ( 0.165 + / - 0.028 ) microg/L , ( 0.166 + / - 0.027 ) microg/L , ( 0.163 + / - 0.025 ) microg/L and ( 0.164 + / - 0.025 ) microg/L in group B , C , D and E separately .