Is Zinc Deficiency a Worldwide Problem and Is There a Silent Epidemic in Saudi Arabia? December 2017 in “ International Journal of Growth and Development ” Ziauddin Ahmed We don't know much about this study yet. We're maintaining the world's largest resposity of hair loss research. You can help out the community by sending a PDF of this study here . Not sure how to get a study's PDF? You can email the authors of the study. View this study on igdjournal.com →