“…Non-invasive assessment of the morphological and functional peripheral circulation may supplement the physical examination and provide a quick, accurately diagnosis, ultimately guiding the correct treatment for both PRP and SRP (Filaci et al, 1999, 2001; Faggioli et al, 2006; Pyrpasopoulou and Aslanidis, 2007; Aschwanden et al, 2008; Caramaschi et al, 2009; Miniati et al, 2009; Shah et al, 2011; Guiducci et al, 2012; Roustit et al, 2012; Cutolo et al, 2013, 2017b; Herrick, 2013, 2017; Cutolo and Sulli, 2015; Gladue et al, 2016; Smith et al, 2016b; Trombetta et al, 2016; Burmester et al, 2017; Kowal-Bielecka et al, 2017; Ruaro et al, 2017a; Rotondo et al, 2018).…”