Hill Physicians Medical Group announced that UCSF Medical Group's physicians are now affiliated with Hill, following the successful completion of a transition plan announced last August. The affiliation took effect Jan. 1, and added more than 500 doctors to Hill's previous roster of 300 primary care doctors in San Francisco. The affiliation came after UCSF Medical Group and San Francisco's Brown & Toland Medical Group ended a long-running partnership in 2009.