Table 1.

Reference Types by Payer and in Sum.

Commercial Payer	Total References	Primary Journal Articles	Review Articles	Expert Opinion	Society Guidelines	Government Report/Guideline	Website	Miscellaneous
Aetna	115	71	33	2	0	2	1	6
Anthem	50	35	13	1	0	1	0	0
Cigna	59	33	17	2	2	0	2	3
HCSC	33	17	13	1	2	0	0	0
Highmark	15	12	2	0	0	0	0	1
United Healthcare	6	1	1	0	3	0	0	1
Totals, n (%)	238	145 (60.9)	65 (27.3)	6 (2.5)	7 (2.9)	3 (1.3)	2 (0.8)	10 (4.2)

Abbreviation: HCSC, Health Care Services Corporation.