00541naa#a2200157#i#450# EN\AUS PUBLISHERS\bibl\5756 20241122131042.5 20211202b2021####ek#y0engy0150####ca RU THE IMPACT OF THE COVID-19 PANDEMIC ON THE RISK OF CLINICAL TRIAL PROTOCOLS AMENDMENTS Conference article/thesis Melbourne AUS PUBLISHERS 2021 3 с. Conference article/thesis local Eleskina Anastasia Alexandrovna Filippova Olga Vsevolodovna w-science.com