According to the following graphic,the most common cause of PCB Failures is a _____________. 
Definitions:
Classification
The organization of data or objects into predefined categories based on their shared characteristics or attributes.
Conventional Medical Approaches
Practices used in the standard care for patients, including pharmacology, surgery, and physical therapy.
Patient Preferences
The desires or choices of a patient regarding their healthcare, informed by their personal values and beliefs.
Alternative Medical Approaches
Treatment and healthcare practices that are not part of the standard medical care, often involving herbal, holistic, or traditional methods.
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