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Garcia, M., Fernandez, E., Schiaffino, A. et al. Phone tracking in a follow-up study. Soz.-Präventivmed. 50, 63–66 (2005). https://doi.org/10.1007/s00038-004-4052-4
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DOI: https://doi.org/10.1007/s00038-004-4052-4