RT Journal Article SR Electronic T1 Patient co-payments for general practice JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 341 OP 341 DO 10.3399/bjgp15X685597 VO 65 IS 636 A1 Simon Gilbert YR 2015 UL http://bjgp.org/content/65/636/341.1.abstract AB