• Saudi Arabia   59 studies
• Senegal   16 studies
• Serbia   135 studies
• Serbia and Montenegro   62 studies
• Seychelles   1 study
• Sierra Leone   1 study
• Singapore   480 studies
• Slovakia   432 studies
• Slovenia   130 studies
• South Africa   859 studies
• Spain   2181 studies
• Sri Lanka   9 studies
• Sudan   5 studies
• Swaziland   1 study
• Sweden   1288 studies
• Switzerland   1443 studies
• Syrian Arab Republic   1 study

Clinical Trials Authorship and Review

Clinical Trials content is provided directly by the U.S. National Institutes of Health via ClinicalTrials.gov and is not reviewed separately by ClinicalTrialsFeeds.org. Every page of specific clinical trials information contains a unique identifier which can be used to find further details directly from the National Institutes of Health.