BÜHLMANN sCAL ELISA:
Levitova A et al.: Clinical Improvement and Reduction in serum calprotectin levels after an intensive exercise programme for patients with AS and non-radiographic spondyloarthritis; Arthritis Research and Therapy: 2016: 18(1): 275. PMID: 27887637 doi: 10.1186/s13075-016-1180-1