@article{HoffmannMeffert2005,
  author    = {Gerd Hoffmann and Hans Meffert},
  title     = {Apparent contradiction between negative effects of UV radiation and positive effects of sun exposure},
  journal   = {GMS german medical science},
  volume    = {3},
  number    = {Doc01},
  pages     = {1 -- 2},
  url       = {http://www.egms.de/en/journals/gms/2005-3/000019.shtml},
  year      = {2005},
}