Authors: M Heliövaara; O Impivaara; K Sievers; T Melkas; P Knekt; J Korpi; A Aromaa Journal: J Epidemiol Community Health Date: 1987-09 Impact factor: 3.710
Authors: P Kannus; M Järvinen; H Kontiala; L Bergius; E Hyssy; E Salminen; A Tuomi; T Unkila; I Valtanen Journal: Ann Rheum Dis Date: 1987-11 Impact factor: 19.103