Authors: Ilona Hromadnikova; Bela Houbova; Dana Hridelova; Sona Voslarova; Pavel Calda; Katerina Nekolarova; Josef Kofer; David Stejskal; Jindrich Doucha; Ondrej Cinek; Jan Vavrirec Journal: BMC Pregnancy Childbirth Date: 2002-05-28 Impact factor: 3.007