Relationship between Bacillus Calmette Guerin Vaccination Policy and Coronavirus Disease-2019 (COVID-19) Incidence - Alyasin, Soheila; Kanannejad, Zahra; Esmaeilzadeh, Hossein; Nabavizadeh, Hesamedin; Ghatee, Mohammad Amin; Amin, Reza (Iranian Journal of Allergy, Asthma and Immunology, 2021)