Funding for this research was provided by:
Departmental Research Fund, Hong Kong Polytechnic University (UA-2G)
Received: 1 November 2017
Accepted: 18 May 2018
First Online: 31 May 2018
Ethics approval and consent to participate
: This research study was conducted in accordance with the Declaration of Helsinki. Ethics approvals were granted from the Departmental Research Committee, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University (HSEARS20140214001) and Joint Chinese University of Hong Kong- New Territories East Cluster Clinical Research Ethics Committee (2014.193). Parents of all participating infants signed an informed consent before data collection on their infants.
: The authors declare that they have no competing interests.
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