@article{RailaWirthChenetal.2004,
  author    = {Jens Raila and Kerstin Wirth and Frank Chen and Ulrich B{\"u}scer and Joachim W. Dudenhausen and Florian J. Schweigert},
  title     = {Excretion of vitamin A in urine of women during Normal pregnancy and pregnancy complications},
  year      = {2004},
}