Bell, Brian, Campbell, Stephen, Carson-Stevens, Andrew, Prosser Evans, Huw, Cooper, Alison, Brindley, Christina, Rodgers, Sarah, Johnson, Christine, Edwards, Adrian, Armstrong, Sarah, Mehta, Rajnikant, Chuter, Antony, Donnelly, Alisa, Ashcroft, Darren M., Lymn, Joanne, Smith, Pam, Sheikh, Aziz, Boyd, Matthew, Avery, Anthony, "Understanding the epidemiology of avoidable significant harm in primary care: protocol for a retrospective cross-sectional study", BMJ Open, 2017