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© 2017 Kristīne Ošiņa, Elina Leonova, Sergejs Isajevs, Larisa Baumane, Evita Rostoka, Tatjana Sjakste, Egils Bisenieks, Gunars Duburs, Brigita Vīgante, Nikolajs Sjakste, published by Institute for Medical Research and Occupational Health
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