Clinical implications of persistently increased blood urea nitrogen/serum creatinine ratio (PI-BUN/Cr) in severe COVID-19 patients by Gustavo Casas Aparicio, Rosario Fernández Plata, Anjarath Higuera Iglesias, David Martínez Briseño, Rolando Claure-Del Granado, Manuel Castillejos Lopez, Joel Vázquez Pérez, Noé Alvarado Vásquez, Rafael Velázquez Cruz, Graciela Hernández Silva, Victor Ruiz, Ángel Camarena, Citlaltepetl Salinas Lara, Martha Tena Suck, Iñaki Montes de Oca Ambriz, Oswaldo Ortiz Toledo, Vianey Arvizu Serrano, Yared Almazan Chaparro, Edgar Flores-Soto, Luz María Torres-Espíndola, Arnoldo Aquino-Gálvez, Victor Hugo Ahumada Topete

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