Study	Reason for exclusion
Al‐Haddad 2006	Cohort study or case report
Anderson 2007	Review
Arora 2009	Review
Basavaraj 2005	Study protocol
Bekkerman 2016	Review
Bell 1988	Cohort study or case report
Bodkin 2016	Cohort study or case report
Borges 2014	Study protocol
Brady 1991	Review
Castell 1990	Study protocol
Chavez 2012	Cohort study or case report
Cheng 2017	Cohort study or case report
Cronan 1980	Cohort study or case report
Damghani 2011	Cohort study or case report
David 2017	Cohort study or case report
Debongnie 1981	Cohort study or case report
Dias 2017	Cohort study or case report
Elhamady 2017	Cohort study or case report
Fan 2017	Sharp/hard foreign body
Fass 2004	Review
Ferrari 2018	Review
Ghumman 2017	Cohort study or case report
Glauser 1979	Cohort study or case report
Goldman 1994	Cohort study or case report
Haas 2014	Cohort study or case report
Hall 1988	Cohort study or case report
Haridy 2017	Cohort study or case report
Hassan 2015	Cohort study or case report
Huang 2015	Cohort study or case report
Ibrahim 2019	Cohort study or case report
Jeen 2001	Sharp/hard foreign body
Kim 2016	Cohort study or case report
Kingsbery 2017	Review
Krzeski 1995	Cohort study or case report
Langoya 2016	Cohort study or case report
Lee 2005	Review
Leopard 2011	Review
Lorrains 2015	Review
Louie 2005	Cohort study or case report
Maglinte 1995	Review
Maini 2001	Cohort study or case report
Mazzadi 1998	Cohort study or case report
Mehta 2001	Sharp/hard foreign body
Monnier 2005	Editorial
Moons 2003	Cohort study or case report
Moores 1996	Cohort study or case report
Morse 2016	Cohort study or case report
Mosca 2001	Cohort study or case report
Nugent 2013	Review
Odelowo 1990	Cohort study or case report
Ooi 2017	Cohort study or case report
Ooi 2017a	Cohort study or case report
Ooi 2018	Cohort study or case report
Ooi 2018a	Cohort study or case report
Pan 2016	Cohort study or case report
Patoulias 2016	Sharp/hard foreign body
Peksa 2019	Review
Price 2007	Review
Robbins 1994	Cohort study or case report
Rodriguez‐Sanchez 2013	Cohort study or case report
Ruan 2019	Cohort study or case report
Smith‐Sivertsen 1985	Cohort study or case report
Sodeman 2004	Cohort study or case report
Thomas 2005	Cohort study or case report
Tihan 2011	Sharp/hard foreign body
Tilakaratne 2012	Review
Tokar 2007	Cohort study or case report
Van Der Sluis 2012	Cohort study or case report
Waltzman 2006	Sharp/hard foreign body
Weant 2012	Review
Willenbring 2018	Cohort study or case report
Woo 2015	Sharp/hard foreign body
Wu 2011	Cohort study or case report
Yan 2014	Cohort study or case report
Yuan 2019	Sharp/hard foreign body
Zamary 2017	Sharp/hard foreign body
Zimmers 1988	Cohort study or case report