What proportion of ethically approved randomised clinical trials can be found in a trial registry?

What proportion of ethically approved randomised clinical trials can be found in a trial registry?

Bibliographic Details
Main Authors: Speich, B, Gryaznov, D, Gloy, V, McCord, K, Agarwal, A, Kasenda, B, Briel, M
Format: Conference item
Published: BioMed Central 2019

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