Author/Authors :
Andrew D Oxman، نويسنده , , John N Lavis، نويسنده , , Atle Fretheim، نويسنده ,
Abstract :
Summary
Background
WHO regulations, dating back to 1951, emphasise the role of expert opinion in the development of recommendations. However, the organisationʹs guidelines, approved in 2003, emphasise the use of systematic reviews for evidence of effects,
