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| 1 | Maternal morbidity after maternalfetal surgery显示文摘 | Golombeck K Ball RH Lee H | 2006 | Am J Obstet Gynecol2006，194，3： | 1 |
| 2 | Cervical pregnancy: a case report 显示文摘 | ROUSSIS P BALL RH FLEISCHER AC | 1992 | J Report Med1992，37，： | 1 |
| 3 | Regional blood flow in asphyxiated fetuses with seizures显示文摘 | Ball RH Espinoza MI Parer JT | 1994 | Am J Obstet Gynecol1994，170，11： | 1 |
| 4 | Increased time-to-pregnancy and first trimester Down' s syndrome screening显示文摘 | Ranta JK Canick JA Ball RH | 2010 | Hum Reprod2010，25，2： | 1 |
| 5 | First-trimester or second-trimester screening, or both, for Down's syndrome 显示文摘 | Malone FD Caniek JA Ball RH | 2005 | New Engl J Med2005，353，： | 1 |
| 6 | First-trimester or second-trimester screening,or both,for Down’s syndrome显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，： | 1 |
| 7 | First-trimester or second-trimester screening, or both, for Down'syndrome 显示文摘 | Malone FD Canick JA Ball RH | 2005 | N EngI J Med2005，353，19： | 1 |
| 8 | First - trimester or second - trimester screening, or both, for Down's syndrome 显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，19： | 1 |
| 9 | Contingent screening for trisomy 21results from a general population screening trial显示文摘 | Malone FD Cuckle H Ball RH | 2005 | Am J Obstet Gynecol2005，193，： | 1 |
| 10 | Increasedtime-tn-pregnancy and first trimester Down' S syndrome screening显示文摘 | RantaJK Canick JA Ball RH | 2010 | Hum Reprod2010，25，2： | 1 |
| 11 | First-trimester or sec- ond-trimester screening, or both, for Down's syndrome显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，： | 1 |
| 12 | First-trimester or sec- ond- trimester screening, or both, for Down' s syndrome 显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，19： | 1 |
| 13 | First-trimester or second-trimester screening,or both, for Down's syndrome, first- and second-trimester evaluation of risk (FASTER) research consortium 显示文摘 | Malone F Canick JA Ball RH | 2005 | N Engl J Med2005，353，： | 1 |
| 14 | First-trimester or second- trimester screening,or both,for Down's syndrome显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，： | 1 |
| 15 | First and se- cond-trimester evaluation of risk for Down syndrome 显示文摘 | Ball RH Caughey AB Malone FD | 2007 | Obstet Gyneeol2007，110，1： | 1 |
| 16 | The manage- ment of acardiac twins : A conservative approach 显示文摘 | Sullivan AE Varner MW Ball RH | 2003 | Am J Obstet Gyneco12003，189，5： | 1 |
| 17 | First -trimester or second- trimester screening or both, for Down 's syndrome 显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，19： | 1 |
| 18 | First-trimester or secondtrimester screening,or both,for Down's syndrome显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，19： | 1 |
| 19 | First - trimester or second - trimester screening, or both, for Down Is syndrome 显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engi J Med2005，353，19： | 1 |
| 20 | A comparison of first-trimester screening, second-trimester screening, and the combination of both for evaluation of risk for down syndrome 显示文摘 | Malone FD Canick JA Ball RH | 2005 | N Engl J Med2005，353，： | 1 |
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