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:Dissociative conscious sedation or in other words dissociative conscious anesthesia is defined as using an intravenous or subcutaneous injection of “low dose ketamine’ in conjunction with narcotics to achieve an acceptable level of sedation, pain relief and amnesia [17].
Category: