Public-sector healthcare establishments that had been in operation for more than 12 months were selected. The FHP units needed to have a complete team (one physician, one nurse, one to two nursing auxiliaries and four to six health agents). For the PHUs, the inclusion criterion was that they should have at least one general clinician. Two FHP units (Vila Saúde and Estrada da Saudade II) and two PHUs (Quitandinha and Dr. Thouzet) were randomly selected. The units were initially included by means of a draw. The draw was carried out using the following method: 1) the units were classified as either FHP units or PHUs; 2) the units were sequentially numbered; 3) each of these numbers was placed separately in a medium-brown opaque envelope without any identification. After the draw, the units were submitted to the inclusion and exclusion criteria of the study.