Adulterants in crack cocaine in Brazil

by Marcelo Ribeiro, Alisson Paulino Trevizol, Rosana Frajzinger, Ariadne Ribeiro, Hannelore Speierl, Luciana Pires, Maristela Andraus, Lolita Tsanaclis, Ana Leonor Sala Alonso, Quirino Cordeiro, Ronaldo Laranjeira