None? As I thought. Go back to your cave troll.
In 1975 the first, and so far, only trial of PE was carried out be Brian Richards, MD, Bachelor of Medicine, Bachelor of Surgery, Bachelor of Science, Fellow of the Royal Academy, Fellow of the Royal Society of Medicine in the UK (in other words, a real physician). The results were published in the British Journal of Sexual Medicine that year. Dr. Richards experiment lasted 3 months, consisted of a tiny random sample size of 64 of which 32 were a control. Of the 32 men involved pro-actively in the trial, 2 dropped out and 2 gained nothing. The remaining 28 gained between 0.94" and 1.4" inches in length and .55" and 1.2" in girth, a success rate of 87.5%.
So far, nobody else has published anything else on the subject.
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