Figure 1

Research flow chart. (A) The selection of instrumental variables needed to fulfill 3 assumptions. (B) The exposure in the study was the white blood cells and their subtypes. The outcome in the study is breast cancer and its subtypes.

Research flow chart. (A) The selection of instrumental variables needed to fulfill 3 assumptions. (B) The exposure in the study was the white blood cells and their subtypes. The outcome in the study is breast cancer and its subtypes.