Association between conflicts of interest and favourable recommendations in clinical guidelines, advisory committee reports, opinion pieces, and narrative reviews: systematic review.
Camilla Hansen NejstgaardLisa BeroAsbjørn HróbjartssonAnders W JørgensenKarsten J JørgensenMary LeAndreas LundhPublished in: BMJ (Clinical research ed.) (2020)
Cochrane Methodology Review Protocol MR000040.