Best solution for snail-pace hair growth?

One major issue I have always had with my hair is the slow pace of growth. I shaved off all my hair in February of 2015 to try to stimulate my follicles for the umpteenth time. It is now 8 days from October 2016, and my hair has grown only about 1 inch in length in over 18 months. Is there a procedure to help speed up growth rate that I could be a candidate for?

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