Mehta, Amar J, Christian Schindler, Laura Perez, Nicole Probst-Hensch, Joel Schwartz, Otto Brändl, Werner Karrer, Jean Marie Tschopp, Thierry Rochat, and Nino Künzli. 2012. “Acute Respiratory Health Effects of Urban Air Pollutants in adults With Different Patterns of Underlying Respiratory Disease”. Swiss Medical Weekly 142 (4142):w13681. https://doi.org/10.4414/smw.2012.13681.