GDF15 and inclusion body myositis: From our own research, the following scheme can be proposed: low end CK and high end GDF-15 and CXCL10 levels point toward IBM, high end CK and intermediate GDF-15 and CXCL10 levels point toward IMNM, and high end CK and low end GDF-15 and CXCL10 point toward a muscular dystrophy.