Received: 2 August 2018
Revised: 17 December 2018
Accepted: 20 December 2018
First Online: 5 August 2019
Change Date: 27 August 2019
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1038/S41370-019-0160-3
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Caregivers of the participating children provided informed written consent before the observations. The study was conducted in accordance with the Declaration of Helsinki and received ethics clearance from Stanford University (Protocol 25863), University of California, Berkeley (2011-09-3652), and the International Centre for Diarrhoeal Disease Research, Bangladesh (PR-11063).