[1] STANFORD UNIV, SCH MED, DEPT HLTH RES & POLICY, STANFORD, CA 94305 USA
[2] KAISER PERMANENTE MED CARE PROGRAM, DIV RES, OAKLAND, CA 94611 USA
[3] TEMPLE UNIV, HLTH SCI CTR, PHILADELPHIA, PA 19122 USA
[4] THOMAS JEFFERSON UNIV HOSP, PHILADELPHIA, PA 19107 USA
[5] UNIV PENN, PRESBYTERIAN MED CTR, PHILADELPHIA, PA 19104 USA
[6] MERCY CATHOLIC MED CTR, FITZGERALD MERCY DIV, PHILADELPHIA, PA USA
[7] MERCY CATHOLIC MED CTR, MISERICORDIA DIV, PHILADELPHIA, PA USA
[8] COOPER HOSP UNIV MED CTR, PHILADELPHIA, PA USA
[9] CHESTNUT HILL HOSP, PHILADELPHIA, PA USA
[10] BRYN MAWR HOSP, PHILADELPHIA, PA USA
[11] CROZER CHESTER MED CTR, PHILADELPHIA, PA USA
[12] SACRED HEART HOSP, PHILADELPHIA, PA USA
[13] JEANES HOSP, FOX CHASE CANC CTR, PHILADELPHIA, PA USA
[14] MED COLL PENN & HAHNEMANN UNIV, PHILADELPHIA, PA USA
[15] FRANKFORD HOSP, PHILADELPHIA, PA USA
[16] FRANKFORD TORRESDALE DIV, PHILADELPHIA, PA USA
[17] ALBERT EINSTEIN MED CTR, PHILADELPHIA, PA 19141 USA
[18] ST JOSEPH HOSP, PHILADELPHIA, PA USA