Low testosterone levels as an independent risk factor for mortality in male patients with COVID-19: Report of a Single-Center Cohort Study in Mexico Ana Lilia Peralta-Amaro; Emily Itzel Pecero-García; José Guadalupe Valadez-Calderón; Julio César Ramírez-Ventura; Luis Alonso Coria-Moctezuma; Jaime Enrique Hernández-Utrera;

Klinefelter syndrome: The characterization of the clinical and sociological features of 51 patients Fernando Mendonça; Selma Souto; Sofia Dória; Davide Carvalho;

Sugar-sweetened beverage intake in relation to reproductive parameters in young men Jonathan Kiwitt-Cárdenas; Julián J. Arense-Gonzalo; Jaime Mendiola-Olivares; Evdochia Adoamnei; Alberto M. Torres-Cantero;