RT Journal Article SR Electronic T1 Seeing the world through different lenses: activity registration differs between two validated accelerometers JF ERJ Open Research JO erjor FD European Respiratory Society SP 00262-2019 DO 10.1183/23120541.00262-2019 VO 6 IS 1 A1 Marieke C. van der Molen A1 Jorine E. Hartman A1 Lowie E.G.W. Vanfleteren A1 Dirk-Jan Slebos YR 2020 UL http://openres.ersjournals.com/content/6/1/00262-2019.abstract AB