Department of Obstetrician and Gynecologists;
King Salman Hospital.;
Riyadh;
Saudi Arabia;
Department of Obstetrician and Gynecologists;
King Faisal specialist Hospital and Research Centre;
Riyadh;
Saudi Arabia;
Department of Medicine;
Faculty at Univali University;
Universidade do Vale do Itajai;
Itajai;
State of Santa Catarina;
South of Brazil;
Brazil;
CERVIX; Twin Pregnancy; ULTRASONOGRAPHY; Cervical Assessment; Delivery;