Is Vitamin D a Special Concern for Vegans?

The following is from:
http://www.vrg.org/journal/vj2009issue2/2009_issue2_vitamin_d.php
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Is Vitamin D a Special Concern for Vegans?

A vegan diet can be planned to provide adequate amounts of vitamin D through use of fortified foods like fortified soymilk. Any person, whether vegan or not, who does not include good sources of vitamin D in his or her diet or take vitamin D supplements can be at risk for not getting adequate vitamin D, especially if sunlight exposure is limited. Some studies have found that vegans have lower vitamin D intakes than do lactoovo vegetarians or meat-eaters.8 This may be because cow's milk (a source of vitamin D) is a more common part of the daily menu for non-vegans than vitamin D fortified foods are for vegans.