1. School of Human; Health and Social Sciences; Central Queensland University; Rockhampton QLD 4702 Australia
2. School of Humanities and Languages, University of New South Wales; Sydney NSW 2052 Australia
3. Department of Chiropractic; Macquarie University; Sydney NSW 2109 Australia
4. Instituto Nacional de Antropología e Historia-Centro INAH Yucatan; Merida Yucatan 97000 Mexico