Medicine
Hydroxychloroquine
Undifferentiated connective tissue disease
Internal medicine
Anti-nuclear antibody
Rheumatoid arthritis
Rheumatology
Connective tissue disease
Systemic lupus erythematosus
Arthritis
Disease
Gastroenterology
Antibody
Autoimmune disease
Autoantibody
Immunology
Coronavirus disease 2019 (COVID-19)
Infectious disease (medical specialty)