The impact of COVID-19 on national program of colorectal cancer screening in Tehran, Iran: a multicenter study - Sadeghi, Amir; Asadzadeh Aghdaei, Hamid; Khalafi, Mohammad Amin; Nazemalhosseini-Mojarad, Ehsan; Ketabi Moghadam, Pardis; Sohrabi, Mohammad-Reza (BMC Cancer, 2023)