@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}
}
@article{EnglertSchaeferRolletal.2003,
  author    = {Englert, Heike and Schaefer, GA. and Roll, S. and Beier, K. and Willich, SN.},
  title     = {Prevalence of Erectile Dysfunction in a Metrolpolitan Population of Men Aged 40-79},
  series = {Gac Sanit},
  volume    = {17 (Suppl 2)},
  journal   = {Gac Sanit},
  issn      = {1578-1283},
  pages     = {175 -- -},
  year      = {2003},
  language  = {en}
}
@article{EnglertSchaeferRolletal.2004,
  author    = {Englert, Heike and Schaefer, GA. and Roll, S. and Ahlers, C. and Beier, K. and Willich, SN.},
  title     = {Association between erectile dysfunction and cardiac risk factors in Berlin men aged 40-79},
  series = {Biometrical J},
  volume    = {46 (Suppl.)},
  journal   = {Biometrical J},
  issn      = {1521-4036},
  pages     = {132 -- -},
  year      = {2004},
  language  = {en}
}
@article{EnglertSchaeferRolletal.2004,
  author    = {Englert, Heike and Schaefer, GA. and Roll, S. and Beier, K. and Willich, SN.},
  title     = {The Prevalence of Erectile Dysfunction using different Definitions},
  series = {J Epi Community Health},
  volume    = {58},
  journal   = {J Epi Community Health},
  issn      = {0143-005X},
  pages     = {20 -- -},
  year      = {2004},
  language  = {en}
}