Data collection
The data collection was performed during the summer of 2018, with a
complementary search during the summer of 2019. The latter search
revealed two additional children meeting the inclusion criteria, both
born in the fall of 2016. The entries by doctors and physiotherapists
working at the children’s hospital were reviewed using a predefined
template (Appendix 1). All data related to age were corrected for
prematurity if appropriate (gestational age <37 weeks). The
first author performed most of the data collection, while the last
author complemented it when needed. Any uncertainties were discussed
until consensus was reached.