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subscription/membership/fee required Atypon https://journals.sagepub.com/doi/10.1016/s0194-5998(99)70126-9?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub 0pubmed
subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0194599899002879
Skin Cancer free resource MedlinePlus Health Information https://medlineplus.gov/skincancer.html
subscription/membership/fee required Wiley https://doi.org/10.1016/s0194-5998(99)70126-9