Baldo, Francesco; Erkens, Remco G A; Mizuta, Mao; Rogani, Greta; Lucioni, Federica; Bracaglia, Claudia; Foell, Dirk; Gattorno, Marco; Jelušić, Marija; Anton, Jordi; Brogan, Paul; Canna, Scott; Chandrakasan, Shanmuganathan; Cron, Randy Q; De Benedetti, Fabrizio; Grom, Alexei; Heshin-Bekenstein, Merav; Horne, AnnaCarin; Khubchandani, Raju; Ozen, Seza; Quartier, Pierre; Ravelli, Angelo; Shimizu, Masaki; Schulert, Grant; Scott, Christiaan; Sinha, Rashmi; Ruperto, Nicolino; Swart, Joost F; Vastert, Sebastiaan; Minoia, Francesca: Current treatment in macrophage activation syndrome worldwide: a systematic literature review to inform the METAPHOR project