Gaab, J., Engert, V., Heitz, V., Schad, T., Schürmeyer, T. H., & Ehlert, U. (2004).
Associations between neuroendocrine responses to the insulin tolerance test and patient characteristics in chronic fatigue
syndrome. Journal of Psychosomatic Research, 56(4),
419-424. doi:10.1016/S0022-3999(03)00625-1.