The objectives are to investigate whether: 

• authors of scientific opinion pieces with personal financial conflicts of interest related to drug, device or medical imaging companies are more likely to recommend the companies' products;
• authors of clinical practice guidelines with personal financial conflicts of interest related to drug, device or medical imaging companies are more likely to recommend the companies' products;
• drug or device advisory committee members with personal financial conflicts of interest related to drug or device companies are more likely to recommend the companies' products for approval;
• formulary committee members with personal financial conflicts of interest related to drug companies are more likely to recommend the companies' products;
• authors of scientific opinion pieces with other types of financial conflicts of interest related to a particular intervention are more likely to recommend the intervention.