Using a Virtual Reality System to Study Balance and Walking in a Virtual Outdoor Environment: APilot Study. - Lars Nyberg; Lillemor Lundin-Olsson; Björn Sondell; Anders Backman; Kenneth Holmlund; Staffan Eriksson; Michael Stenvall; Erik Rosendahl; Marcus Maxhall; Gustaf Bucht (Cyberpsychology Behav. Soc. Netw., 2006)