{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T17:40:50Z","timestamp":1791999650415,"version":"4.4.0"},"reference-count":16,"publisher":"Massachusetts Medical Society","issue":"21","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["N Engl J Med"],"published-print":{"date-parts":[[2015,11,19]]},"DOI":"10.1056\/nejmoa1509233","type":"journal-article","created":{"date-parts":[[2015,10,5]],"date-time":"2015-10-05T14:00:55Z","timestamp":1444053655000},"page":"2015-2024","source":"Crossref","is-referenced-by-count":928,"title":["Possible Subclinical Leaflet Thrombosis in Bioprosthetic Aortic Valves"],"prefix":"10.1056","volume":"373","author":[{"given":"Raj R.","family":"Makkar","sequence":"first","affiliation":[{"name":"From Cedars\u2013Sinai Heart Institute (R.R.M., H.J., T.C., A.T., J.F., D.B., W.C., M.K.) and Cedars\u2013Sinai Medical Center (G.F.) \u2014 both in Los Angeles; Rigshospitalet, University of Copenhagen, Copenhagen (K.F.K., O.D.B., N.T.O., L.S.); MedStar Health Research Institute, Washington, DC (F.M.A., A.D.P., N.J.W.); Hackensack University Medical Center and Joseph M. Sanzari Children\u2019s Hospital, Hackensack, NJ (C.E.R., V.J.); Lenox Hill Heart and Vascular Institute of New York (C.A.K.) and Columbia University..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gregory","family":"Fontana","sequence":"additional","affiliation":[{"name":"From Cedars\u2013Sinai Heart Institute (R.R.M., H.J., T.C., A.T., J.F., D.B., W.C., M.K.) and Cedars\u2013Sinai Medical Center (G.F.) \u2014 both in Los Angeles; Rigshospitalet, University of Copenhagen, Copenhagen (K.F.K., O.D.B., N.T.O., L.S.); MedStar Health Research Institute, Washington, DC (F.M.A., A.D.P., N.J.W.); Hackensack University Medical Center and Joseph M. 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Sanzari Children\u2019s Hospital, Hackensack, NJ (C.E.R., V.J.); Lenox Hill Heart and Vascular Institute of New York (C.A.K.) and Columbia University..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tarun","family":"Chakravarty","sequence":"additional","affiliation":[{"name":"From Cedars\u2013Sinai Heart Institute (R.R.M., H.J., T.C., A.T., J.F., D.B., W.C., M.K.) and Cedars\u2013Sinai Medical Center (G.F.) \u2014 both in Los Angeles; Rigshospitalet, University of Copenhagen, Copenhagen (K.F.K., O.D.B., N.T.O., L.S.); MedStar Health Research Institute, Washington, DC (F.M.A., A.D.P., N.J.W.); Hackensack University Medical Center and Joseph M. Sanzari Children\u2019s Hospital, Hackensack, NJ (C.E.R., V.J.); Lenox Hill Heart and Vascular Institute of New York (C.A.K.) and Columbia University..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Klaus F.","family":"Kofoed","sequence":"additional","affiliation":[{"name":"From Cedars\u2013Sinai Heart Institute (R.R.M., H.J., T.C., A.T., J.F., D.B., W.C., M.K.) and Cedars\u2013Sinai Medical Center (G.F.) \u2014 both in Los Angeles; Rigshospitalet, University of Copenhagen, Copenhagen (K.F.K., O.D.B., N.T.O., L.S.); MedStar Health Research Institute, Washington, DC (F.M.A., A.D.P., N.J.W.); Hackensack University Medical Center and Joseph M. 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Sanzari Children\u2019s Hospital, Hackensack, NJ (C.E.R., V.J.); Lenox Hill Heart and Vascular Institute of New York (C.A.K.) and Columbia University..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Federico M.","family":"Asch","sequence":"additional","affiliation":[{"name":"From Cedars\u2013Sinai Heart Institute (R.R.M., H.J., T.C., A.T., J.F., D.B., W.C., M.K.) and Cedars\u2013Sinai Medical Center (G.F.) \u2014 both in Los Angeles; Rigshospitalet, University of Copenhagen, Copenhagen (K.F.K., O.D.B., N.T.O., L.S.); MedStar Health Research Institute, Washington, DC (F.M.A., A.D.P., N.J.W.); Hackensack University Medical Center and Joseph M. 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