1.
Kuna-Dibbert B, Keidel D, Schweinzer K, Leuenberger P, Ackermann-Liebrich U. Longitudinal validity of spirometers - a challenge in longitudinal studies. Swiss Med Wkly [Internet]. 2005 Aug. 27 [cited 2024 Apr. 25];135(3334):503-8. Available from: https://smw.ch/index.php/smw/article/view/523