These three functions (`measureToOids`, `patientToOids `, `patientToSdc `) nicely abstract this code, but they don't seem to be related to the ValueSetsCollection (they don't reference the content of the collection at all). I think a better home for these would be on the collections that are being passed in (Measures and Patients). ie implement `measures.toOids()`, `patients.toOids()`, and `patients.toSdc()`.