My friend just now referred me to a research that seems to be a very detailed and comprehensive about the Health 2.0 sector.
The report called E-Health 2.0.
You can purchase the full 108 pages report or try first to read the free executive summary.
quotation for describing the article :
"The report details how the application of web 2.0 technologies is now driving far-reaching changes in healthcare systems in the UK, USA and Europe, a trend it terms e-health 2.0."
Enjoy your time reading it.