Funding for this research was provided by:
Limburg Provincial Authorities (200130003)
Friesland Campina (LLMV00)
Received: 24 August 2020
Accepted: 21 October 2020
First Online: 9 December 2020
Ethics approval and consent to participate
: The need for ethical approval has been waived by the Medical Ethics Committee Zuyderland in Heerlen (MEC 14-N-142). All participants were required to complete an informed consent form in accordance with the Declaration of Helsinki, signed by both parents/caregivers, and by the children in case they are 12 years or older.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.