Gunther Eysenbach, John Powell, Marina Englesakis, Carlos Rizo, Anita Stern
Eysenbach G, Powell J, Englesakis M, Rizo C, Stern A.
Health related virtual communities and electronic support groups: systematic review of the effects of online peer to peer interactions
BMJ 2004; 328 :1166
doi:10.1136/bmj.328.7449.1166