Llanos-Salcedo, C., Muñoz-Farfán, K. and Maguiña, J.L. 2020. Reference values of spirometry parameters in healthy workers at different altitude levels in Peru. ACTA MEDICA PERUANA. 37, 4 (Dec. 2020). DOI:https://doi.org/10.35663/amp.2020.374.1061.