RT Journal Article SR Electronic T1 Knee arthroplasty: a window of opportunity to improve physical activity in daily life, sports and work JF BMJ Open Sport & Exercise Medicine JO BMJ OPEN SP EX MED FD BMJ Publishing Group Ltd SP e000822 DO 10.1136/bmjsem-2020-000822 VO 6 IS 1 A1 Coenen, Pieter A1 Straat, Carlien A1 Kuijer, P Paul YR 2020 UL http://bmjopensem.bmj.com/content/6/1/e000822.abstract AB