Front. public health. Front. public health. Online multimodal rehabilitation programme to improve symptoms and quality of life for adults diagnosed with long COVID-19: a Randomised Clinical Trial protocol León-Herrera Sandra Universidad de Zaragoza Magallón-Botaya Rosa Universidad de Zaragoza Oliván-Blázquez Bárbara Universidad de Zaragoza Sagarra-Romero Lucía Martín Jaurrieta Carlos Méndez-López Fátima Universidad de Zaragoza 2023 research-article