Synergistic effects of virtual reality and traditional treatment methods in the management of chronic obstructive pulmonary disease: a systematic review and meta-analysis of randomized controlled trials 1Sports Rehabilitation Teaching and Research Office of the School of Physical Education, Anqing Normal University, Anqing, Anhui, China 2Department of Common Basic, Anqing Medical College, Anqing, Anhui, China DOI 10.7717/peerj.20047 Academic Editor Daniel van den Hoek Subject Areas...