Wipff J, Gallier G, Dieude P, Avouac J, Tiev K, Hachulla E, Granel B, Diot E, Sibilia J, Mouthon L, Meyer O, Kahan A, Varret M, Boileau C, Allanore Y. Angiotensin-converting enzyme gene does not contribute to genetic susceptibility to systemic sclerosis in European Caucasians. J Rheumatol. 2009 Feb;36(2):337–40. doi: 10.3899/jrheum.080622. PMID: 19132786.