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Italian men's world number one Sinner still faces the threat of a possible suspension after he twice tested positive for an anabolic steroid in March.

Boldenone is an anabolic steroid that can increase muscle mass growth.

The 28-year-old had played regularly at the four Grand Slams, represented Poland at the 2020 Olympics and reached a career-high ranking when he was told a urine test showed traces of an anabolic steroid.

"This work implies that young male individuals with key inherited genetic changes have a greater risk of developing electrical problems in the heart in response to anabolic steroid abuse."

In cases that reached a sanction, the most commonly found doping substance was the diuretic furosemide in Russia, the anabolic steroid stanozolol in India and clenbuterol in China, the report said.