Transdermal testosterone gel. Don't take blood from the arm where gel is applied.

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@article{Nizar2010TransdermalTG, title={Transdermal testosterone gel. Don't take blood from the arm where gel is applied.}, author={Hisham Nizar and Anjali Balasanthiran and D L Morganstein and Bernard Norman and Kevin Shotliff}, journal={BMJ}, year={2010}, volume={341}, pages={c4014} }