Cystatin C is a marker for acute kidney injury, but not for mortality among COVID-19 patients in Mexico Karime Ramos-Santos; Arturo Cortes-Telles; María Elena Uc-Miam; Azalia Avila-Nava; Roberto Lugo; Rodolfo Chim Aké; Ana Ligia Gutiérrez-Solis;

Navigating the waves in Colombia: a cohort study of inpatient care during four COVID-19 waves David E. Rebellón-Sánchez; Tania M. Guzmán; Sarita Rodriguez; Julio Llanos-Torres; Daniela Vinueza; Eric Tafurt; Estefanía Beltrán; Álvaro Martínez; Fernando Rosso;

Frailty and health-related quality of life among older people living with HIV pre- and post-COVID-19 pandemic onset: A cross-sectional study Thiago S. Torres; Jovanice S. Jesus; Daniel Arabe; Lusiele Guaraldo; Fabião A. Meque; Flavia Serrao Lessa; Lívia Dumont Facchinetti; Rita Estrela; Valdilea G. Veloso; Beatriz Grinsztejn; Sandra W. Cardoso;