Difficulties in differential diagnosis of Sjögren's Syndrome and Systemic Lupus Erythematosus

Piotr Krawiec, Bogdan Batko, Antoni Skura, Teresa Adamek-Guzik, Marta Cześnikiewicz-Guzik, Marcin Krzanowski, Iwona Rydz-Stryszowska, Natalia Ryszawa-Mrózek, Tomasz Guzik