RT Journal Article SR Electronic T1 Completing questionnaires by proxy. JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 184 OP 184 VO 44 IS 381 A1 Kolnaar, B G A1 van den Hoogen, H J A1 van Weel, C YR 1994 UL http://bjgp.org/content/44/381/184.1.abstract AB