Supplemental Material for JAAD Research Letter: "Risk factors for and prognostic impact of positive surgical margins after excision of Merkel cell carcinoma"

Supplemental Material for JAAD Research Letter: "Risk factors for and prognostic impact of positive surgical margins after excision of Merkel cell carcinoma"《美国皮肤病学会杂志》（Journal of the American Academy of Dermatology，JAAD）研究快报《默克尔细胞癌（Merkel cell carcinoma）切除术后手术切缘阳性的危险因素及其预后影响》的补充材料