Subacromial impingement syndrome: a systematic review of arthroscopic versus open subacromial decompression  
Dong Yan, Zhang Ke-yuan, Sun Xue-bin, Li Gang, Nijiati Abulimiti, Liu Yang
Chinese Journal of Tissue Engineering Research . 2014, (46): 7538 -7544 .  DOI: 10.3969/j.issn.2095-4344.2014.46.031