1. Obstetric admissions to the intensive therapy care unit of a tertiary institution;Quah;Ann. Acad. Med. Singapore,2001
2. Respiratory disease;McCormick,2001
3. Obstetric patients requiring critical care. A five year review;Kilpatrick;Chest,1992
4. Mechanical ventilation in an obstetric population: characteristics and delivery rates;Jenkins;Am. J. Obstet. Gynecol.,2003
5. Maternal emergencies requiring controlled ventilation: epidemiology and prognosis;Ben Letaifa;J. Gynecol. Obstet. Biol. Reprod. (Paris),2002