AU - Landon BE, Keating NL, Barnett ML, et al TI - VAriation in patient-sharing networks of physicians across the united states PT - JOUR DP - 2012 TA - JAMA pages = {265-273}, VI - 308 IP - 3 AID - 10.1001/jama.2012.7615 [doi] 4100 - http://dx.doi.org/10.1001/jama.2012.7615 SO - JAMA July 18, 2012 308(3):265