RT Journal Article SR Electronic T1 Making health habitual JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 70 OP 71 DO 10.3399/bjgp13X662966 VO 63 IS 607 A1 Louisa Polak YR 2013 UL http://bjgp.org/content/63/607/70.3.abstract AB