trying

It means changing the parameters of that test one variable at a time, trying to get from correlation to causation.

Two GPs arrived, but Mrs MacKinnon said: "They were trying to tend to the wounds, but there was too much blood."

Expectant mothers and women trying to conceive should continue to take supplementary folic acid - the synthetic version of the vitamin folate - as currently advised by medical practioners.

In addition, the NHS recommends women who are trying for a baby take folic acid supplements for approximately three months before getting pregnant, and for at least 12 weeks after becoming pregnant.

"He was trying to get me hooked on crack so he could do whatever he wanted to me," one of the women told the BBC.