Authors: C P van Schayck; C van Weel; H Folgering; A L Verbeek; C L van Herwaarden Journal: Scand J Prim Health Care Date: 1989-10 Impact factor: 2.581
Authors: M R Sears; D R Taylor; C G Print; D C Lake; Q Q Li; E M Flannery; D M Yates; M K Lucas; G P Herbison Journal: Lancet Date: 1990-12-08 Impact factor: 79.321