ID	Search	Hits
#1	(“shoulder impingement” OR “subacromial impingement” OR “subacromial pain” OR “rotator cuff”):ti,ab,kw (Word variations have been searched)	1425
#2	MeSH descriptor: [Subacromial impingement syndrome] explode all trees	280
#3	MeSH descriptor: [Rotator Cuff] explode all trees	318
#4	#1 OR #2 OR #3	1425
#5	(“eccentric exercise” OR “eccentric exercises” OR “eccentric training” OR “eccentric strengthening” OR “eccentric strength training”):ti,ab,kw (Word variations have been searched)	694
#6	#4 AND #5	27