Nowadays, several HPV prophylactic vaccines have either reached the earliest stage of human testing or are close to it.
(several HPV prophylactic vaccines; have either reached; the earliest stage of human testing; T:Nowadays) (several HPV prophylactic vaccines; are; close to it)
several HPV prophylactic vaccines several HPV prophylactic vaccines
have either reached are
the earliest stage of human testing T:Nowadays
close to it