“…The data for the analysis are drawn from 12 countries from across 5 continents ( Table 1): Bangladesh (10), Brazil (11,12), Chile (13), Kenya (14), Malawi (15), Mexico (16), Papua New Guinea (PNG) (17), Senegal (18), The Gambia (19), USA (20), UK (21)(22)(23), and Zambia (24). Initially, these data were located through a list of research groups that conducted deuterium oxide measurements of lactation kept in Coward's records and completed with a literature search.…”