1Sackett, D. L., Rosenberg, W. M., Gray, J. A., Haynes, R. B., & Richardson, W. S. (1996). Evidence based medicine. BMJ, 312(7023), 71–72.
2Moher, D., Liberati, A., Tetzlaff, J., & Altman, D. G. (2009). Preferred reporting items for systematic reviews. PLoS Medicine, 6(7), e1000097.
3American Psychological Association. (2020). Publication manual of the APA (7th ed.). APA.
4Field, A. (2018). Discovering statistics using IBM SPSS statistics (5th ed.). SAGE Publications.
5Chevalier, G., Sinatra, S. T., Oschman, J. L., Sokal, K., & Sokal, P. (2012). Earthing: Health implications. Journal of Environmental and Public Health, 2012, 291541.
6Creswell, J. W., & Creswell, J. D. (2018). Research design (5th ed.). SAGE Publications.
7Oschman, J. L., Chevalier, G., & Brown, R. (2015). The effects of grounding on inflammation. Journal of Inflammation Research, 8, 83–96.