Baseline Characteristics of the Eligible Studies.

Abbreviations: HNC = head and neck cancer, RTOG = the radiation therapy oncology group, EORTC = European Organization for Research and Treatment of Cancer, EBRT = external beam radiation therapy, CTCAE = Common Terminology Criteria for Adverse Events. NA: not availablea Breast cancer, HNC and meningioma;b Cervical cancer and endometrial cancer;c method based on CTCAE, in which G2c was defined as at least one moist desquamation or interruption of radiotherapy due to toxicity.d method developed by University of Michigan;Baseline Characteristics of the Eligible Studies.