An Artificial Intelligence–Driven Digital Health Solution to Support Clinical Management of Patients With Long COVID-19: Protocol for a Prospective Multicenter Observational Study - Aïna Fuster-Casanovas; Luis Fernandez-Luque; Francisco J Nuñez-Benjumea; Alberto Moreno Conde; Luis G Luque-Romero; Ioannis Bilionis; Cristina Rubio Escudero; Irene Alice Chicchi Giglioli; Josep Vidal-Alaball (JMIR Research Protocols, 2022)