Ensaio clínico: Diferenzas entre revisións
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Depending on product type and development stage, investigators initially enroll volunteers or patients into small [[Pilot experiment|pilot studies]], and subsequently conduct progressively larger scale comparative studies. Clinical trials can vary in size and cost, and they can involve a single research center or [[multicenter trial|multiple centers]], in one country or in multiple countries. [[Clinical study design]] aims to ensure the [[Validity (statistics)|scientific validity]] and [[reproducibility]] of the results.
Costs for clinical trials can range into the billions of dollars per approved drug.<ref>{{cite journal | doi = 10.1016/j.jhealeco.2016.01.012| pmid = 26928437| title = Innovation in the pharmaceutical industry: New estimates of R&D costs| journal = Journal of Health Economics| volume = 47| pages = 20–33| year = 2016| last1 = Dimasi| first1 = Joseph A| last2 = Grabowski| first2 = Henry G| last3 = Hansen| first3 = Ronald W| hdl = 10161/12742
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