author = { Hjalgrim, Helle AND Hahnemann, Johanne M AND Kjaer, Inger AND Broendum-Nielsen, Karen },

title = { Absence of nasal bone and detection of trisomy 21 },

publisher = {Elsevier BV},

isbn = {0140-6736},

keywords = { General Medicine },

year = {2002},

url = { http://slubdd.de/katalog?TN_libero_mab2 }