title: Retention of blood donors: strategies to fulfill the requirements of blood centers.
authors.affiliation: Head of the Blood Donors Apheresis Department, Fundação Pró-Sangue - Hemocentro de São Paulo, São Paulo, SP, Brazil. Blood Transfusion Service, Hospital Nove de Julho, São Paulo, SP, Brazil.
authors.forename: Cesar
authors.initials: C
authors.lastname: de Almeida Neto