Merged in issue750PHExray2019 (pull request #319)
Refs #750, #181 (#181 is incidental!)
PR to ready for review
Docs at https://docs.openrem.org/en/issue750phexray2019/i_exporting.html#phe-2019-ct-survey-and-ipem-phe-2019-paediatric-ct-survey
Refs #750, #181 (#181 is incidental!)
PR to ready for review
Docs at https://docs.openrem.org/en/issue750phexray2019/i_exporting.html#phe-2019-ct-survey-and-ipem-phe-2019-paediatric-ct-survey