Class II treatment sucess rate in 2- and 4- premolar extraction protocols - Janson, Guilherme dos Reis Pereira; Brambilla, Adriana da Costa; Henriques, José Fernando Castanha; Freitas, Marcos Roberto de; Neves, Leniana Santos Neves (American Journal of Orthodontics and Dentofacial Orthopedics, 2004)