Huygens, M.W.J., Swinkels, I.C.S., Verheij, R.A., Friele, R., Schayck, O.C.P. van, Witte, L.P. de. Understanding the use of email consultation in primary care using a retrospective observational study with data of Dutch electronic health records. BMJ Open: 2018, 8(1), e01923