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Sources of telomere length assessment. (A) Based on the number of articles. 76% of studies evaluated leukocyte TL, while buccal cell, placenta, sperm and saliva are the other resources. (B) Based on the number of participants. Among these studies, leukocyte was used for 87.6% of population, placenta for 3.7%, sperm for 3.7%, saliva for 2.8% and buccal cell for 2.2%. TL, telomere length.
