1.   But there has been a spate of positive nandrolone cases around the world over the past year, prompting speculation that the drug is contained in nutritional supplements.

2.   However, there have been a spate of positive nandrolone cases the past year, prompting speculation the drug is contained in nutritional supplements.

3.   Prof. William Schanzer of the Institute of Biochemistry in Cologne said impure food supplements may be the cause of a rash of positive nandrolone tests in recent years.

4.   There has been a rash of positive international nandrolone cases in recent years.

5.   There has been a rash of positive nandrolone cases in recent years.