In the past Julien I.E. Hoffman has collaborated on articles with Peter Oishi and Lucy S. Brevetti. One of their most recent publications is Clinical studyThe natural history of ventricular septal defects in infancy☆. Which was published in journal The American Journal of Cardiology.
More information about Julien I.E. Hoffman research including statistics on their citations can be found on their Copernicus Academic profile page.