Application of isotope-selective non-dispersive infrared spectrometry for the evaluation of the 13C-urea breath test: comparison with three concordant methods by Coelho L.G.V., Reber M., Passos M.C.F., Aguiar R.O.A., Casaes P.E., Bueno M.L., Yazaki F.R., Castro F.J., Vieira W.L.S., Franco J.M.M., Castro L.P.

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