Development and Preliminary Validation of a MALDI-TOF MS Assay Using KTI as an Internal Standard for Serum M-Protein Light Chain Analysis in Multiple Myeloma: A Pilot Study. - Wang J; Zhao Y; Xie S; Liu H; Di M; Wang B; Tang B; Xie W; Yang X; Lai Z; Dong Y (Medicina (Kaunas, Lithuania), 2026)