Study characteristics
In total, 2148 records were identified through the initial database search, resulting in 1470 records for screening. After abstract and full-text screening, a final list of 321 records underwent standardized data extraction. In total, we found 253 records that were relevant to the objective of this study. Eleven out of the 253 records (4.3%) discussed the definition of rITP (Fig. 1). Among the 11 studies that discussed the definition of rITP, seven were retrospective and four were prospective. Seven of the 11 studies specifically included rITP patients. Of the seven studies, three of the studies classified rITP as “chronic ITP,” three of the studies included solely rITP patients, and three of the studies did not differentiate between chronic and rITP.