Macrophage Activation Syndrome as the Initial Manifestation of Severe Juvenile Onset Systemic Lupus Erythematosus. Favorable Response to Cyclophosphamide Alfonso Torres Jiménez, Eunice Solís Vallejo, Maritza Zeferino Cruz, Adriana Céspedes Cruz, Berenice Sánchez Jara

Hemophagocytic Syndrome as the Initial Manifestation of Systemic Lupus Erythematosus César Antonio Egües Dubuc, Miren Uriarte Ecenarro, Carlos Meneses Villalba, Vicente Aldasoro Cáceres, Iñaki Hernando Rubio, Joaquín Belzunegui Otano

Multicentric Prevalence Study of Anti-P Ribosomal Autoantibodies in Juvenile Onset Systemic Lupus Erythematosus Compared With Adult Onset Systemic Lupus Erythematosus Cecilia N. Pisoni, Sebastián Andrés Muñoz, Carolina Carrizo, Micaela Cosatti, Analía Álvarez, Diana Dubinsky, Eleonora Bresan, Ricardo Russo, Ezequiel Borgia, Mercedes García, Pierina Sansinanea, María Cristina Basta, Maria Agustina D’Amico, Juan Carlos Barreira, Eliana Lancioni, Enrique Soriano, Carmen de Cunto, Ana Beron, Alicia Eimon