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doi:10.1186/s13063-021-05951-w Montelukast Dyspnea Randomized controlled trial COVID-19 SARS-CoV-2 Long COVID Primary care Quality of life Health status Double-blind placebo-controlled randomized clinical trial to assess the efficacy of montelukast in mild to moderate respiratory symptoms of patients with long COVID: E-SPERANZA COVID Project study protocol Francisco Mera Cordero Sara Bonet Monne Jesús Almeda Ortega Ana García-Sangenís Oriol Cunillera Puèrtolas Sara Contreras-Martos Gemma Alvarez Muñoz Ramon Monfà Escolà Marina Balanzó Joué Rosa Morros Pedrós Betlem Salvador-Gonzalez 2022-01-06T11:23:04+01:00 2022-01-06T11:23:04+01:00 2022-01-04T07:41:46+08:00 Arbortext Advanced Print Publisher 9.1.440/W Unicode uuid:2b64e1d6-e5c1-4de9-8d28-180c1c7292b5 uuid:5d1f1665-6eb2-48b6-a100-cfc994fb2b03 default 1 converted uuid:2b64e1d6-e5c1-4de9-8d28-180c1c7292b5 converted to PDF/A-2b pdfToolbox 2022-01-04T07:47:07+08:00 2 B Francisco Mera Cordero http://orcid.org/0000-0002-6599-0506 Springer 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