Health systems performance in health outcomes, health financing and COVID-19 pandemic: Lessons from 31 countries - Pirhossein Kolivand; Jalal Arabloo; Peyman Saberian; Taher Dorooudi; Soheila Rajaie; Fereshte Karimi; Behzad Raei; Masoud Behzadifar; Arash Parvari; Seyed Jafar Ehsanzadeh; Saeid Homayoun; Shahrzad Salehbeigi; et al. (PLoS ONE, 2025)