The reasons seem apparent in Klein's view.
Parkinson's disease is a progressive nervous system disorder that affects movement. Symptoms start gradually, sometimes starting with a barely noticeable tremor in just one hand. Tremors are common, but the disorder also commonly causes stiffness or slowing of movement.
In the 65th minute, Dalian's Ke Zhao added a goal of his own and sealed the 4-0 victory.
He said he was looking forward to battling for his place alongside players such as Paul Pogba, Bruno Fernandes, Nemanja Matic and Fred.
"This victory is very important to me - I've worked so hard to get this win," said the 27-year-old Kazakh.
"Prize money and allowances have been equalled for men's and women's football, which means female players will earn the same as the men," Brazilian Football Confederation (CBF) president Rogerio Caboclo said in a virtual news conference.
PP Sports, owned by Chinese retail giant Suning Group, had signed a three-year deal with Premier League in 2016. The broadcaster has reportedly withheld a payment of 160 million pounds rights fees which were due to happen in March.
Earlier, sixth seed Petra Kvitova of the Czech Republic edged past Ukraine's Kateryna Kozlova 7-6 (3), 6-2, and eighth seed Petra Martic of Croatia beat fellow Ukrainian Kateryna Bondarenko 6-3, 6-4 to also advance into third round. Enditem
PP Sports released a statement on Thursday night, claiming the termination was just a "strategic adjustment".
Luneng, who lost to Dalian Pro 1-0 in the last round, hit the woodwork twice during the game against Suning.
Strikers Mehdi Ghaedi and Arsalan Motahari pulled two back for Esteghlal FC in the second half.