RT Journal Article SR Electronic T1 Response to: 'Size of the shadow' JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 510 OP 511 DO 10.1136/heartjnl-2020-318919 VO 107 IS 6 A1 Valentina Mantegazza A1 Valentina Volpato A1 Paola Gripari A1 Sarah Ghulam Ali A1 Laura Fusini A1 Gianpiero Italiano A1 Manuela Muratori A1 Gianluca Pontone A1 Gloria Tamborini A1 Mauro Pepi YR 2021 UL http://heart.bmj.com/content/107/6/510.2.abstract AB