RT Journal Article SR Electronic T1 21st century health services challenges for an ageing population JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 518 OP 518 DO 10.3399/bjgp12X656739 VO 62 IS 603 A1 Mayur Lakhani YR 2012 UL http://bjgp.org/content/62/603/518.1.abstract AB