[1] Univ North Carolina Chapel Hill, UNC Eshelman Sch Pharm, Campus Box 7573, Chapel Hill, NC 27599 USA
[2] Univ North Carolina Chapel Hill, Cecil G Sheps Ctr Hlth Serv Res, Campus Box 7573, Chapel Hill, NC 27599 USA
[3] Univ North Carolina Chapel Hill, Div Pharmaceut Outcomes & Policy, UNC Eshelman Sch Pharm, Campus Box 7573, Chapel Hill, NC 27599 USA
[4] Univ North Carolina Chapel Hill, Dept Hlth Policy & Management, Chapel Hill, NC 27599 USA
[5] Jeffers Mann & Artman Pediat & Adolescent Med, 2406 Blue Ridge Rd, Raleigh, NC 27607 USA
[6] Univ Wisconsin, Dept Family Med, 1100 Delaplaine Ct, Madison, WI 53715 USA
[7] Mission Hlth Syst, Olson Huff Ctr, 11 Vanderbilt Pk Dr, Asheville, NC 28803 USA
[8] Univ North Carolina Chapel Hill, Sch Med, Dept Pediat, Chapel Hill, NC 27599 USA