title: A Method to Investigate Seasonal Variation in Hospitalization for Copd in A Midwestern US State.
authors.affiliation: University of Minnesota, minneapolis, MN, USA.
authors.forename: W
authors.initials: W
authors.lastname: Su
authors.affiliation: University of Minnesota, minneapolis, MN, USA.
authors.forename: R
authors.initials: R
authors.lastname: Zhao
authors.affiliation: American Lung Association of the Upper Midwest, st paul, MN, USA.
authors.forename: J
authors.initials: J
authors.lastname: Heins-Nesvold
authors.affiliation: University of Minnesota, minneapolis, MN, USA.
authors.forename: A
authors.initials: A
authors.lastname: Carlson