CharaCteristiCs of non-melanoma skin CanCer depending upon oCCupational solar uV exposure dosage assist. prof. alexandra-irina Butacu 1 , md, marc Wittlich 2 , md, prof. swen malte John 3 , md, phd, prof. sabina Zurac 4 , md, phd, assoc. prof. horatiu moldovan 5 , md, phd, prof. george-sorin tiplica 6 , md, phd