About Clinica Ruiz. We are the largest patient volume autoimmune disease HSCT treatment center in the world. Doctor Ruiz Argüelles and Doctor Gómez-Almaguer have performed more than 2500 HSCT procedures during more than 20 years for hematological and autoimmune diseases, out of which over 700 have been for MS.About Us‧Treatments‧Accommodation‧Our Team‧Testimonials‧FAQS.