Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: A recent scientific study funded by a medical corporation concluded that its product is not as harmful as consumers have reported. Identify a possible problem with this study.
The results of the study may be influenced by bias.
Conflict of interest.