2002n-499 abnormalities bloodgasmonitoring complications congresses diagnosis diseases female fetaldiseases fetus generativeorgans genitaldiseases high-risk multiplepregnancy obstetrics physiology pregnancy pregnancycomplications pregnancyoutcome prenatal prenataldiagnosis qy450i611986c therapy transcutaneous transcutaneousbloodgasmonitoring triplets ultrasonicimaging ultrasonicsinobstetrics ultrasonography wq100u471983 wq100u472000 wq235t8352002