Sampling plan and methodological aspects: a household healthcare survey in Piauí oleh Lays Arnaud Rosal Lopes Rodrigues, Danilla Michelle Costa e Silva, Edina Araújo Rodrigues Oliveira, Layanne Cristina de Carvalho Lavôr, Rosana Rodrigues de Sousa, Rumão Batista Nunes de Carvalho, Gilvo de Farias Junior, Laura Maria Feitosa Formiga, Artemizia Francisca de Sousa, Maria Regina Alves Cardoso, Betzabeth Slater, Wolney Lisbôa Conde, Adriana de Azevedo Paiva, Karoline de Macêdo Gonçalves Frota