Acknowledgements
GM, DI and MD carried out sample preparation and performed experiments. VV, VL were responsible for the selection and diagnosis of LN patients. MR, LR and GM wrote the manuscript. MR, LR, and VV conceived and designed the study and edited the manuscript. All authors have read and approved the final manuscript.
This work was supported by the Bulgarian National Science Fund (DNTS/France 01/11/09.05.2017).