Krul, J., Sanou, B., Swart, E.L., and Girbes, A.R. (2012). Medical Care at Mass Gatherings: Emergency Medical Services at Large-Scale Rave Events. (Abstract only.) Prehospital Disaster Medicine. 27(1):71-74.
The authors reviewed Dutch rave dance parties over a five-year period and determined that "a medical team of six healthcare workers for every 10,000 rave party visitors" would suffice. They made additional planning recommendations regarding staff and treatment protocols.