1 “... though the role of vitamin C has been known since the early 1930s, only recently have researchers been...”

2 “... and perspectives of B-group vitamins. Novel methods to detect folates in pregnant women, the use and role of folate...”

3 “... as the roles of niacin (vitamin B3), pyridoxine (vitamin B6), folate (vitamin B9), and vitamin B12 in numerous...”