BRANTH STEFAN, HAMBRAEUS LEIF, PIEHL-AULIN KARIN, ESSÉN-GUSTAVSSON BIRGITTA, ÅKERFELDT TORBJÖRN, OLSSON ROGER, STRIDSBERG MATS, and RONQUIST GUNNAR. 2009. “Metabolic Stress-Like Condition Can Be Induced by Prolonged Strenuous Exercise in Athletes”. Upsala Journal of Medical Sciences 114 (1):12-25. https://doi.org/10.1080/03009730802579778.