Anfinsen, K P, Berghoff, N, Priestnall, S L, Suchodolski, J S, Steiner, J M, Allenspach, K, "Urinary and faecal N-methylhistamine concentrations do not serve as markers for mast cell activation or clinical disease activity in dogs with chronic enteropathies", Acta Veterinaria Scandinavica, 2014