Table 1.

Search strategy with use of a combination of key words.

Boolean Operator	Term	Field
	“coronary artery disease” OR “coronary heart disease” OR stenosis OR atherosclero*	Title
AND	“left main coronary” OR “left coronary”	Title/abstract
AND	“coronary bifurcat*” OR “bifurcat* angl*” OR “artery bifurcat*” OR angul* OR angle*	Title
NOT	stent*	Title