A lot of statistical and methodological crimes being committed here. "Patients... were queried on their use of supplements at registration and during treatment

A lot of statistical and methodological crimes being committed here. "Patients... were queried on their use of supplements at registration and during treatment". Hazard ratios. The blender approach of looking at all the reported vitamins at once, and picking anything that looks significant. People with the money to buy supplements take supplements...so this runs right into the health/wealth correlation.