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Participant timeline according to the SPIRIT guidelines
-t1 = birth to extubation
0 = immediate period prior to initiation of data acquisition
t1 = 60-min recording prior to extubation
t2 = 5-min recording prior to extubation
t3 = immediate period post-extubation
t4 = first 72 h period post-extubation
t5 = period between 72 h and 14 days post-extubation
t6 = discharge, death or transfer from the neonatal intensive care unit
