“…56, 58-64, 66, 67, 69, 71-74, 76-78, 80, 81, 83, 84, 87, 88 Treatment period varied from 1 session 66 to 2 years 85 , with 4 weeks 61,63,72,73,75,84,86,88,89 as most common period. Other treatment durations were 2 weeks, 57,74,77,78,80 3 weeks, 59,64,79,87 5 weeks, 56, 65 6 weeks, 68, 69, 82 8 weeks 58, 62 and 12 weeks. 60,70,71,81 Most studies used the same follow up period as their treatment period, 56, 60, 61, 63-66, 70-72, 74, 75, 77, 78, 80, 83, 84, 86-88 however, some studies used a longer follow up period up to 3 months, 57, 59, 69 24 weeks, 79 6 months, 58,62 8 months, 68 1 year, 82 and 2 years.…”