Identification of clinical and demographic variables associated with severe Covid-19 in subjects with rheumatic disease in a third-level hospital in Mexico City - Jiménez-Jiménez, Xóchitl; Alvarado-Romano, Virginia; Galaviz-Pérez, Reyna Amparo; Maya-Piña, Lucía Verónica; Solís-Hernandez, Claudia Gisel; Acuña-Gonzalez, Denise; Vuelvas-Olmos, César Rubén; Jimenez-Jimenez, Saul (Salud pública de México, 2023)