The OpenSAFELY Collaborative ., Brown A., Fisher L., Curtis H., Wiedemann M., Hulme W., Hopcroft LEM., Cunningham C., Speed V., Costello R., Galloway J., Russell M., Bechman K., Kurt Z., Croker R., Wood C., Walker A., Schaffer A., Bacon SCJ., Mehrkar A., Hickman G., Bates C., Cockburn J., Parry J., Hester F., Harper S., Goldacre B., MacKenna B.