The external validity of machine learning-based prediction scores from hematological parameters of COVID-19: A study using hospital records from Brazil, Italy, and Western Europe - Ali Safdari; Chanda Sai Keshav; Deepanshu Mody; Kshitij Verma; Utsav Kaushal; Vaadeendra Kumar Burra; Sibnath Ray; Debashree Bandyopadhyay (PLoS ONE, 2025)