Received: 22 November 2019
Accepted: 11 May 2020
First Online: 20 May 2020
Ethics approval and consent to participate
: Ethical approval was gained via the Brighton and Sussex Medical School Research Governance & Ethics Committee (Ref no. 17/020/BRO) on 06/03/2017.
: Not applicable.
: NS is funded by a UKRI Future Leaders Fellowship at Imperial College London and is a non-remunerated Trustee of the Human Milk Foundation.