It's quite new to me about PRP in gel/filler form. I'd like to know is it a safe procedure? Is there any serious side effects apart from bruising/swelling? After injected, can it migrate and how to dissolve? How long it's actually last? (Is it true that a single session can last from 3 to 6 months and require a complete 3 sessions to extend the result to last up to 2-3 years)