Impaired cobalamin status predicts spontaneous abortion in Brazilian women: a pilot study - Guerra-Shinohara, Elvira Maria; Pereira, Perla Menezes; Kubota, Ananka Midori; Reis, Jucilene Lopes; Silva, Thaiomara Alves; D'Almeida, Vânia; Allen, Robert; Stabler, Sally (International Conference on Homocysteine Metabolism, 2009)