Answer:
Young was arrested after asking the company doctor whether he had considered thallium poisoning as a possible cause of the mystery illness.
Times, Sunday Times (2006)
Another possible cause is polycystic ovary syndrome - get your doctor to test you for this.
The Sun (2011)
He agreed atrazine was one possible cause.
Times, Sunday Times (2012)
Another possible cause is an unvented flue.
Times, Sunday Times (2016)
This can be very helpful in detecting one possible cause of your symptoms.
Times, Sunday Times (2016)
