Letter to the editor: blood processing and sample storage have negligible effects on methylation.

[ 10 ] identified some variance in GDM between different DNA extraction methods (Autopure LIS, Qiagen; Puregen TM, Gentra Systems; Chemagic Magnetic Separation Module I, Chemagen); however, this variation did not reach statistical significance ( n = 9) [ 10 ] and was comparable to technical variation identified by Bulla et al.

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