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 512 OP 512 DO 10.1136/archdischild-2018-316433 VO 105 IS 5 A1 Petros Koltsidopoulos A1 Charalampos Skoulakis YR 2020 UL http://adc.bmj.com/content/105/5/512.abstract AB