Kümpfel, T., Schwan, M., Pollmächer, T., Yassouridis, A., Uhr, M., Trenkwalder, C., et al. (2007). Time of interferon- β 1a injection and duration of treatment affect clinical side effects and acute changes of plasma hormone and cytokine levels in multiple sclerosis patients. Multiple Sclerosis, 13(9), 1138-1145.