@article{WillichEnglertSchaeferetal.2006,
  author    = {Willich, SN. and Englert, Heike and Sch{\"a}fer, GA. and Roll, S. and Beier, KM.},
  title     = {Association between cardiovascular risk factors and erectile dysfunction - a population-based study},
  series = {Eur Heart J},
  volume    = {27 (Suppl.)},
  journal   = {Eur Heart J},
  issn      = {0195-668X},
  pages     = {361 -- -},
  year      = {2006},
  language  = {en}
}
@article{EnglertSchaeferRolletal.2007,
  author    = {Englert, Heike and Sch{\"a}fer, GA. and Roll, S. and Ahlers, CJ. and Beier, K. and Willich, SN.},
  title     = {Prevalence of erectile dysfunction among middle-aged men in a metropolitan area in Germany},
  series = {Int J Impotence Res},
  volume    = {19},
  journal   = {Int J Impotence Res},
  issn      = {0955-9930},
  pages     = {183 -- 188},
  year      = {2007},
  language  = {en}
}