How to report the antinuclear antibodies (anti-cell antibodies) test on HEp-2 cells: guidelines from the ICAP initiative

Carlos Alberto von Mühlen, Ignacio Garcı́a-De La Torre, María Infantino, Jan Damoiseaux, Luís Eduardo Coelho Andrade, Orlando Gabriel Carballo, Karsten Conrad, Paulo Luiz Carvalho Francescantônio, Marvin J. Fritzler, Manfred Herold, Werner Klotz, Wilson de Melo Cruvinel, Tsuneyo Mimori, Minoru Satoh, Lucile Musset, Edward K. L. Chan