One such definition that includes these various facets is that proposed by Pagliari [30], who defined eHealth as:

“…an emerging field of medical informatics, referring to the organisation and delivery of health services and information using the Internet and related technologies. In a broader sense, the term characterises not only a technical development, but also a new way of working, an attitude, and a commitment for networked, global thinking, to improve healthcare locally, regionally and worldwide by using information and communication technology.”
http://plosmedicine.org/article/info:doi/10.1371/journal.pmed.1000126#article1.body1.sec2.p3

This definition of ehealth is wrongly attributed to Pagliari. In fact, it is a verbatim quote from Eysenbach G. What is e-health? J Med Internet Res 2001;3(2):e20. URL: http://www.jmir.org/2001/2/e20/
doi: 10.2196/jmir.3.2.e20
PMID: 11720962