Letter by guazzi et Al regarding article, "comprehensive use of cardiopulmonary exercise testing identifies adults with congenital heart disease at increased mortality risk in the medium term"

Letter by guazzi et Al regarding article, "comprehensive use of cardiopulmonary exercise testing identifies adults with congenital heart disease at increased mortality risk in the medium term" / M. Guazzi, V. Labate, A. Vitelli. - In: CIRCULATION. - ISSN 0009-7322. - 126:8(2012 Aug 21), pp. e122-e122.