Dr. Justina Tan is Senior Consultant at the Department of Rheumatology, Allergy and Immunology, Tan Tock Seng Hospital Singapore. She is a member of the Singapore Society of Rheumatology (SSR) and Allergy and Clinical Immunology Society of Singapore (ACIS). She is principal investigator of the Immunodeficiency disorders registry at Tan Tock Seng Hospital.