unproven

However, this is one of several unproven theories on why this might be the case.

These figures may include cases where the incident was either accidental or unproven.

Some of these practices offer unproven alternatives to vaccination with little or no evidence to back them up.

It comes as Health Secretary Robert F Kennedy, Jr continues to focus on unproven treatments like cod liver oil, and his casting doubt on the safety of the vaccines.

The government is committing billions of pounds to an "unproven" green technology for reducing planet-warming gases without considering the impact on consumers' bills, MPs have warned.