Study	Reason for exclusion
Bauman 2009	Not a randomised controlled trial
Costantino 2010	This trial compared ultrasound guidance and external jugular vein
Curtis 2015	The participants in this study were children
DRKS00013797	Not a randomised controlled trial
Evans 2013	Not a randomised controlled trial
Galen 2018	Not a randomised controlled trial
Hill 2017	Not a comparison of USG peripheral intravenous cannulation and landmark method (long‐axis vs short‐axis USG)
NCT01602133	Not a randomised controlled trial
NCT02360163	This study was withdrawn (no enrolment was achieved)
NCT03440944	Not a comparison of ultrasound‐guided peripheral intravenous cannulation and landmark method (midline vs USG)
NCT03457259	Not a comparison of ultrasound‐guided peripheral intravenous cannulation and landmark method (midline vs peripheral, central, or peripherally inserted central lines)
NCT04234347	Not a comparison of ultrasound‐guided peripheral intravenous cannulation and landmark method
Raio 2018	Not a randomised controlled trial
Troisi 2013	We contacted the author for further information but received no response

USG: ultrasound guidance