A survey of national and multi-national registries and cohort studies in juvenile idiopathic arthritis: challenges and opportunities by Timothy Beukelman, Janneke Anink, Lillemor Berntson, Ciaran Duffy, Justine A. Ellis, Mia Glerup, Jaime Guzman, Gerd Horneff, Lianne Kearsley-Fleet, Ariane Klein, Jens Klotsche, Bo Magnusson, Kirsten Minden, Jane E. Munro, Martina Niewerth, Ellen Nordal, Nicolino Ruperto, Maria Jose Santos, Laura E. Schanberg, Wendy Thomson, Lisette van Suijlekom-Smit, Nico Wulffraat, Kimme Hyrich

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