Found this old Powerpoint on the computer and thought I'd share.
Bristow, R., Yang, W. & Lu, M. (2010). An Application of the Global Sustainable Tourism Criteria in Health Tourism. In: Watts, Clifton E., Jr.; Fisher, Cherie LeBlanc, eds. Proceedings of the 2009 Northeastern Recreation Research Symposium. Gen. Tech. Rep. NRS-P-66. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 97-103. http://www.treesearch.fs.fed.us/pubs/35650.