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:Prothrombotic disorders were present in 11 children: antiphospholipid antibodies (n=5) [21, 31, 32, 36]; combined protein S deficiency and antiphospholipid antibodies (n=2) [36]; protein S deficiency (n=2) [16, 22]; protein C deficiency (n=1) [42]; heterozygote APC resistance (n=1) [26].
Category: