An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Van de Werf F, Janssens L, Brzostek T, Mortelmans L, Wackers FJ, Willems GM, Heidbüchel H, Lesaffre E, Scheys I, Collen D, et al.Van de Werf F, et al. Among authors: willems gm.J Am Coll Cardiol. 1993 Aug;22(2):407-16. doi: 10.1016/0735-1097(93)90044-2.J Am Coll Cardiol. 1993.PMID: 8335810Free article.Clinical Trial.
Van de Velde AS, De Boodt L, Cadenas de Llano-Pérula M, Laenen A, Willems G.Van de Velde AS, et al.Eur J Orthod. 2021 Jun 8;43(3):324-331. doi: 10.1093/ejo/cjab006.Eur J Orthod. 2021.PMID: 33830217