Infants and children 6–59 months of age with severe wasting and/or nutritional oedema: evidence gaps identified during WHO guideline development - Praveen Kumar; Marko Kerac; Indi Trehan; James A Berkley; Robert H J Bandsma; Celeste E Naude; Allison I Daniel; Aida Alsadeeq; Hedwig Deconinck; Nicky Dent; Rozina Khalid; Debbie S Thompson (BMJ Global Health)