For citations:
Eleskina A.A., Pyatigorskaya N.V., Filippova O.V. Risks of clinical trial protocol amendments according to duration of the trial. Kachestvennaya Klinicheskaya Praktika = Good Clinical Practice. 2023;(2):35-41. (In Russ.) https://doi.org/10.37489/2588-0519-2023-2-35-41