Is there a maximum number of rf microneedling treatments that can be done for something like old stretch marks? For example, can I do 8 treatments in a row spaced one month apart or is that counterproductive? Will the treatments interfere with new collagen production from previous treatments? Is it better to do maybe 3, then take a few months off to let new collagen form and then continue? Or can I do 8 in a row one-month apart? Thanks!