LOCUS (LOng Covid–Understanding Symptoms, events and use of services in Portugal): A three-component study protocol - J. P. Dinis Teixeira; Santos, M.; Patrícia Soares; Luísa de Azevedo; Patrícia Barbosa; Andreia Vilas Boas; João V. Cordeiro; Dias, S.; Marta Fonseca; Goes, A.; Maria João Lobão; Marta Moniz; et al. (PLOS ONE, 2023)