Fig. 2

Breakdown of the included studies by (A) the types of neoplasms they focused on (with the area of each rectangle/tumor type being proportional to its share of the sample), B their decades of initiation, (C) the types of interventions they investigated, and (D) the extent to which the industry was involved in their conduct. The percentages shown may not add up to 100% due to rounding (A), or because the categories displayed are not mutually exclusive (C)