“…Most studies referred to the shoulder pain as “subacromial impingement syndrome” (SIS) [ 28 , 39 , 40 , 41 , 42 , 44 , 47 ], “subacromial shoulder impingement” (SSI) [ 29 ], or “subacromial pain syndrome” (SAPS) [ 30 , 45 , 48 ]. Some studies used generic labels such as “shoulder pain syndrome” (SPS) [ 33 , 35 , 37 ], “shoulder pain”, [ 38 ] or “no specific shoulder pain” [ 46 ]. Three studies referred to diagnostic labels that recently appeared, namely “rotator cuff disorder/syndrome” [ 32 , 34 ] and, more frequently, “rotator cuff-related shoulder pain” [ 34 ].…”