HALFORD C., EKSELIUS L., ANDERZEN I., ARNETZ B., and SVÄRDSUDD K. “Self-Rated Health, Life-Style, and Psychoendocrine Measures of Stress in Healthy Adult Women”. Upsala Journal of Medical Sciences, vol. 115, no. 4, Oct. 2010, pp. 266–274, doi:10.3109/03009734.2010.496910.