[Knowledge, acceptability and use of the Billings natural family planning method]

Nelson Shozo Uchimura1, Taqueco Teruya Uchimura, Lívia Maria Martins Almeida

  • 1Departamento de Medicina da Universidade Estadual de Maringá (UEM), Maringá, Paraná, Brasil. nuchimura@pop.com.br

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