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Primary sites and subtypes of melanoma in Japan, created from the statistics based on Hospital-Based Cancer Registries and nationwide statistical surveys [4, 5]. The numbers in round brackets refer to proportion among all types of melanoma. The numbers in square brackets refer to proportion among each subtype of melanoma. Abbreviations: ALM, acral lentiginous melanoma; NM, nodular melanoma; SSM, superficial spreading melanoma; LMM, lentigo maligna melanoma; GI, gastrointestinal
