Useful links

www.clinicaltrials.gov: National Institut of Health ΗΠΑ ανακοίνωση clinical trials

https://www.clinicaltrialsregister.eu: Εuropean Medicines Agency ανακοίνωση clinical trials

http://www.strobe-statement.org: Strobe Statement (Strengthening the reporting of observational studies in epidemiology)

https://eudract.ema.europa.eu/