RT Journal Article SR Electronic T1 Hourglass neck mass JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP archdischild-2018-316433 DO 10.1136/archdischild-2018-316433 A1 Petros Koltsidopoulos A1 Charalampos Skoulakis YR 2019 UL http://adc.bmj.com/content/early/2019/01/17/archdischild-2018-316433.abstract AB