eFigure 4.

Substages of clavicle ossification (stage 2a: the length of ossified epiphysis is maximally one-third the metaphysis width; stage 2b: the epiphysis length is between one-third and two-thirds [maximum] the metaphysis width; stage 2c: the epiphysis length is more than two-thirds the metaphysis width; stage 3a: a maximum of one-third of the epiphyseal plate is ossified; stage 3b: between one-third and two-thirds [maximum] of the epiphyseal plate is ossified; stage 3c: more than two-thirds of the epiphyseal plate is ossified)