Authors: J R Copeland; M J Kelleher; J M Kellett; A J Gourlay; B J Gurland; J L Fleiss; L Sharpe Journal: Psychol Med Date: 1976-08 Impact factor: 7.723
Authors: P S German; S Shapiro; E A Skinner; M Von Korff; L E Klein; R W Turner; M L Teitelbaum; J Burke; B J Burns Journal: JAMA Date: 1987 Jan 23-30 Impact factor: 56.272