Authors: M Keuter; A van Eijk; M Hoogstrate; M Raasveld; M van de Ree; W A Ngwawe; W M Watkins; J B Were; A D Brandling-Bennett Journal: BMJ Date: 1990-09-08
Authors: S Fogh; A Schapira; I C Bygbjerg; S Jepsen; C H Mordhorst; K Kuijlen; P Ravn; A Rønn; P C Gøtzsche Journal: Br Med J (Clin Res Ed) Date: 1988-03-19