RT Journal Article SR Electronic T1 APMS contracts JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 888 OP 888 DO 10.3399/bjgp08X376267 VO 58 IS 557 A1 Charles Zuckerman YR 2008 UL http://bjgp.org/content/58/557/888.1.abstract AB