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Serum homocysteine and methylmalonic acid concentrations in Chinese Shar-Pei dogs with cobalamin deficiencyGrützner, Niels; Heilmann, Romy M.; Stupka, Kenneth C.; Rangachari, Venkat R.; Weber, Katja; Holzenburg, Andreas; Suchodolski, Jan S.; Steiner, Jörg M. · The Veterinary Journal · 2013