Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:All individuals with schizophrenia received antipsychotic medication (amisulpiride, aripiprazole, clozapine, flupenthixole, olanzapine, quetiapine or risperidone; mean chlorpromazine equivalents (CPZe) 297 (SD 178); CPZe for second generation antipsychotics were calculated as suggested by Woods [63].
Category: