In October I wrote a piece for the World Economic Forum blog on health data and questions around who (should) own it.
The amount of available health-related data is exploding. The increase is driven by both healthcare data, such as electronic medical records, but also user-generated data, such as activity and sleep profiles collected by wearables. The available data is set to more than double every two years until 2020, according toa study by EMC and the research firm IDC. This translates into a 15-fold increase between 2013 and 2020. If one imagines this amount of data stored on tablet computers, the resulting stack, which in 2013 is around 8,800 km high, would be more than one third of the way to the moon by 2020.
Continue reading here: http://www.weforum.org/agenda/2015/10/who-should-own-our-health-data