Intended for healthcare professionals

Correspondence

β Endorphin: a factor in “fun run” collapse?

Br Med J (Clin Res Ed) 1987; 294 doi: https://doi.org/10.1136/bmj.294.6584.1415-c (Published 30 May 1987) Cite this as: Br Med J (Clin Res Ed) 1987;294:1415