[1] Tufts Med Ctr, Boston, MA USA
[2] Tufts Univ, Inst Clin Res & Hlth Policy Studies, Tufts Med Ctr, Tufts Clin & Translat Sci Inst, Boston, MA 02111 USA
[3] Brown Univ, Alpert Med Sch, Ctr Primary Care & Prevent, Pawtucket, RI USA
[4] Brigham & Womens Hosp, Boston, MA 02115 USA
[5] Harvard Univ, Sch Med, Boston, MA USA
[6] Houston Hlth Serv Res & Dev, Med Care Line & Res Care Line, Houston, TX USA
[7] Baylor Coll Med, Sect Immunol Allergy & Rheumatol, Houston, TX 77030 USA
[8] Univ Massachusetts, Sch Med, Dept Quantitat Hlth Sci, Worcester, MA USA