PUBLICATIONS OF THE NATIONAL PUBLIC HEALTH INSTITUTE 552,798 HERTZEN LEENA VON Chlamydia pneumoniae infection in chronic constructive pulmonary disease - diagnostic, epidemiological and immunological aspects : academic dissertation / Leena von Hertzen ; National Public Health Institute, Department in Oulu and University of Helsinki, Department of Biosciences, Division of General Microbiology Helsinki, Finland. - Helsinki : [Julkaisi-ja-Utgivare-Publisher], 1996. - 75, [49] s. : wykr. ; 25 cm (Publications of the National Public Health Institute, ISSN 0359-3584) ISBN 951-740-028-4