RT Journal Article SR Electronic T1 ACTIVITY SAMPLING JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 837 OP 837 VO 25 IS 160 A1 Harden, K. A. YR 1975 UL http://bjgp.org/content/25/160/837.3.abstract AB