TY CONF TI THE IMPACT OF THE COVID-19 PANDEMIC ON THE RISK OF CLINICAL TRIAL PROTOCOLS AMENDMENTS KW COVID-19 KW pandemic KW clinical trials KW amendment KW clinical trial protocol JO SCIENTIFIC RESEARCH OF THE SCO COUNTRIES: SYNERGY AND INTEGRATION. OCTOBER 27, 2021. BEIJING, PRC AU Eleskina, A.A. AU Filippova, O.V. PY 2024 PB AUS PUBLISHERS