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:IMTG fractional synthesis rate was calculated as previously described for use with stable isotopes in humans, using plasma palmitate as the precursor pool from which IMTG is synthesized (47):
IMTG FSR(%h) EIMTG palm (t1) EIMTG palm (t0)
Eplasma palm (t1) Eplasma palm (t0)
1 4 100
where EIMTG palm(t1) and Eplasma palm(t1) are enrichments of palmitate in IMTG and plasma after 4 h of infusion and EIMTG palm(t0) and Eplasma palm(t0) are enrichments of background palmitate in IMTG and plasma, respectively.
Category: