Åsa Nääv1, Lena Erlandsson1, Christina Isaxon2, Ebba Malmqvist3, Stefan Hansson1
(1. Institute of clinical sciences, Department of Obstetrics and Gynaecology, Lund University, Lund, Sweden, 2. Faculty of engineering LTH, Aerosol Technology, Lund University, Lund, Sweden, 3. Institute of laboratory sciences, Occupational and Environmental Medicine, Lund University, Lund, Sweden)