Mala Arora FRCOG FICOG FICMCH (Series editor)Director, Noble IVF Centre, Faridabad, Haryana; Consultant, Fortis La Femme, New Delhi, India Asha Rijhsinghani MD FACOGProfessor, Maternal Foetal Medicine, Albany Medical College, New York, USA Baha M Sibai MD FACOGProfessor and Fellowship Director, Maternal Foetal Medicine, Department of Obstetrics and Gynaecology, The University of Texas Health Science Centre, Houston, Texas, USA