Valery Spiridonov, a man who has volunteered to be the first person to undergo a head transplant, attends a news conference in Vladimir, Russia, June 25, 2015. The 30-year-old Russian, who has a degenerative muscle condition known as Werdnig-Hoffman, wants to become the first person ever to undergo a human head transplant. REUTERS/Maxim Zmeyev TPX IMAGES OF THE DAY

Valery Spiridonov, a man who has volunteered to be the first person to undergo a head transplant, attends a news conference in Vladimir, Russia, June 25, 2015. The 30-year-old Russian, who has a degenerative muscle condition known as Werdnig-Hoffman, wants to become the first person ever to undergo a human head transplant performed by Italian neurosurgeon Dr. Sergio Canavero who says he believes he has a 90 percent chance of success. REUTERS/Maxim Zmeyev 

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Valery Spiridonov, a man who has volunteered to be the first person to undergo a head transplant, is assisted while being transported during a news conference in Vladimir, Russia, June 25, 2015. The 30-year-old Russian, who has a degenerative muscle condition known as Werdnig-Hoffman, wants to become the first person ever to undergo a human head transplant. Italian neurosurgeon Dr. Sergio Canavero is expected to perform the first human head transplant and says he believes he has a 90 percent chance of success. REUTERS/Maxim Zmeyev

Valery Spiridonov, a man who has volunteered to be the first person to undergo a head transplant, attends a news conference in Vladimir, Russia, June 25, 2015. The 30-year-old Russian, who has a degenerative muscle condition known as Werdnig-Hoffman, wants to become the first person ever to undergo a human head transplant performed by Italian neurosurgeon Dr. Sergio Canavero who says he believes he has a 90 percent chance of success. REUTERS/Maxim Zmeyev 

Valery Spiridonov, a man who has volunteered to be the first person to undergo a head transplant, attends a news conference in Vladimir, Russia, June 25, 2015. The 30-year-old Russian, who has a degenerative muscle condition known as Werdnig-Hoffman, wants to become the first person ever to undergo a human head transplant performed by Italian neurosurgeon Dr. Sergio Canavero who says he believes he has a 90 percent chance of success. REUTERS/Maxim Zmeyev

Valery Spiridonov, a man who has volunteered to be the first person to undergo a head transplant, is assisted before a news conference in Vladimir, Russia, June 25, 2015. The 30-year-old Russian, who has a degenerative muscle condition known as Werdnig-Hoffman, wants to become the first person ever to undergo a human head transplant performed by Italian neurosurgeon Dr. Sergio Canavero who says he believes he has a 90 percent chance of success. REUTERS/Maxim Zmeyev