I get that there's benefit to a centralized health database if you're in a country with socialized medicine, but if dealing with private doctors, why not let the market provide this capability? My primary GP uses one version [1], and I get that there would be several competing others until some convergence happens. But at least with these private providers, if one fails or falls out of trust, patients and doctors can move to another - your data isn't permanently locked with an untrustworthy government.