Issues with memory, spatial awareness and information processing problems were identified as possible overhangs from the virus in post-COVID-19 patients who were followed up within eight weeks.
The attacks, in six locations including near a synagogue in the centre of the city, were carried out by "several suspects armed with rifles", police said on Monday night.
It was only Djokovic's third loss of the year, after being disqualified for hitting a line judge with a ball at the U.S. Open and losing the French Open final to Rafael Nadal.
