1 International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh; International Vaccine Institute, Seoul, South Korea; Institute of Clinical Medicine, University of Oslo, Oslo 0424, Norway. Electronic address: asma.aziz@ivi.int.
2 Institute of Clinical Medicine, University of Oslo, Oslo 0424, Norway; Oslo University Hospital, Oslo, Norway.
3 International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh.
4 International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh; International Vaccine Institute, Seoul, South Korea; UCLA Fielding School of Public Health, Los Angeles, CA, USA; Korea University Vaccine Innovation Center, Seoul, South Korea.