Effect of Tai Chi on muscle strength, physical endurance, postural balance and flexibility: a systematic review and meta-analysis http://orcid.org/0000-0002-2656-8038Christian Wehner1, Cornelia Blank1, Marjan Arvandi2, Carina Wehner3, Wolfgang Schobersberger1 1Institute for Sports Medicine, Alpine Medicine and Health Tourism, Private University for Health Sciences Medical Informatics and Technology, Hall, Austria 2Institute of Public Health, Medical Decision Making and HTA, Private University...