Clinicaltrials
Clinicaltrials
http://clinicaltrials.ifpma.org/no_cache/en/myportal/index.htm
Cochrane
Cochrane
http://www.cochrane.nl
Controlled Trials
Controlled Trials
http://www.controlled-trials.com
Knaw
Knaw
http://www.knaw.nl
Martindalecenter
Martindalecenter
http://www.martindalecenter.com/Medical.html
Nwo
Nwo
http://www.nwo.nl
Onderzoeksinformatie
Onderzoeksinformatie
http://www.onderzoeksinformatie.nl
Statline
Statline
http://statline.cbs.nl