More Than Skin Deep: Moving From a Skin-Based Phenotypic Model to Molecular Classification of Systemic Sclerosis

I.K.S. Ng, MMed, Division of Rheumatology and Allergy, Department of Medicine, National University Hospital, and Yong Loo Lin School of Medicine, National University of Singapore.
D.M. Chong, medical student, Yong Loo Lin School of Medicine, National University of Singapore.
A.A. Sule, MBBS, Division of Rheumatology and Allergy, Department of Medicine, National University Hospital, Singapore, Singapore.
J.W.W. Lim, MMed, Division of Rheumatology and Allergy, Department of Medicine, National University Hospital, and Yong Loo Lin School of Medicine, National University of Singapore.

CONTRIBUTIONS: IKSN: writing – original draft, conceptualization; DMC, AAS: writing – review & editing; JWWL: writing – review & editing, supervision, conceptualization.
FUNDING: The authors declare no funding or support for this work.
COMPETING INTERESTS: The authors declare no conflicts of interest relevant to this article.

Address correspondence to Dr. J.W.W. Lim, Division of Rheumatology and Allergy, Department of Medicine, National University Hospital, 5 Lower Kent Ridge Road, Singapore 119074. Email: julian_lim{at}nuhs.edu.sg.