An international multi-center serum protein electrophoresis accuracy and M-protein isotyping study. Part I: factors impacting limit of quantitation of serum protein electrophoresisTurner, Katherine; Frinack, Jody; Ettore, Michael; Zemtsovskaja, GalinaClinical chemistry and laboratory medicine (CCLM)2020 / p. 533-546 : ill https://doi.org/10.1515/cclm-2019-1104 An international multi-center serum protein electrophoresis accuracy and M-protein isotyping study. Part II: limit of detection and follow-up of patients with small M-proteinsJacobs, Joannes; Turner, Katherine; Graziani, Maria Stella; Zemtsovskaja, GalinaClinical chemistry and laboratory medicine (CCLM)2020 / p. 547-559 : ill https://doi.org/10.1515/cclm-2019-1105