Chronic airflow limitation and its relation to respiratory symptoms among ever-smokers and never-smokers: a cross-sectional study by Per Wollmer, Viktor Hamrefors, Kjell Torén, Kenneth Caidahl, Anders Blomberg, Göran Bergström, Jan Engvall, Maria Eriksson, Martin Sandelin, Hanan A Tanash, Carl Johan Östgren, Eva Lindberg, Christer Janson, Linus Schioler, Anne Lindberg, Anders Andersson, Annelie F Behndig, David Kylhammar, Anders Lindén, Andrei Malinovschi, Hans Lennart Persson, Jonas Eriksson Ström, Jenny Vikgren, C. Magnus Sköld

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