FDG-PET/CT(A) imaging in large vessel vasculitis and polymyalgia rheumatica: joint procedural recommendation of the EANM, SNMMI, and the PET Interest Group (PIG), and endorsed by the ASNC - Slart, R; Glaudemans, A; Chareonthaitawee, P (Eur J Nucl Med Mol Imaging, 2018)