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Article History

Received: 7 June 2021

Accepted: 16 December 2021

First Online: 5 January 2022

Declarations

:

: The study was conducted in accordance with the principles of the Declaration of Helsinki, and the study protocol was approved by the University Kebangsaan Malaysia ethics committee, Medical Research and Ethics Committee, Selangor and Federal Territory of Kuala Lumpur state health office, and Districts health department. An informed consent form was signed by each participant’s parent(s) or legally acceptable representative(s) before enrollment into each study. If the parents were illiterate, an independent witness fully explained and signed the informed consent form. Also, informed consent form was signed by physicians and nurses (healthcare practitioners).

: Not applicable.

: All author involved in these studies received grants from Sanofi-Aventis (Malaysia) Sdn Bhd through their respective institutions for the conduct of this study but did not receive any direct payment from Sanofi-Aventis (Malaysia) Sdn Bhd in this regard. They may have received reimbursement for expenses of conference attendance for the presentation of data from these studies.