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Flow diagram of study participants. 1Reason for no samples obtained: pregnancy sickness (n = 2 in 10-µg/d group, n = 2 in 20-µg/d group), unable to attend appointment (n = 2 in 10-µg/d group,n = 2 in 20-µg/d group). 2Reasons for no samples obtained: pregnancy sickness (n = 1 in 20-g/d group), unable to attend appointment (n = 5 in 10-µg/d group, n = 2 in 20-µg/d group), preterm delivery (n = 4 in 10-µg/d group, n = 1 in 20-µg/d group).
