This lecture was delivered as part of the Portuguese-language Basic Training course "Abordagem prática da ultrassonografia na obstetrícia e ginecologia", in Sao Paulo, Brazil in April 2019.
A/Prof. Conrado Coutinho (Brasil)
President of FEBRASGO Perinatology Committee, Member of ISUOG Clinical Standards Committee, Member of ISUOG Courses Subcommittee