AUTHOR=Bussmann Johannes B. TITLE=One plus one equals three (or more …): combining the assessment of movement behavior and subjective states in everyday life JOURNAL=Frontiers in Psychology VOLUME=4 YEAR=2013 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2013.00216 DOI=10.3389/fpsyg.2013.00216 ISSN=1664-1078