“…152,176 -181 One level III 153 and four level IV prognostic studies were reviewed. 152,177,178,182 In the pharmacologic therapeutic study category, two level II, 183,184 four level III, [185][186][187][188] and four level IV studies 189 -192 were reviewed. For nonpharmacologic therapeutic studies, there was one level II study, 193 two level III studies, 194,195 and ten level IV studies.…”