The following sentence contains a transitional word or phrase:
Hypnosis likewise is another promising but unproven treatment.
Which revision correctly punctuates the sentence?
Hypnosis, likewise is another promising but unproven treatment.
Hypnosis; likewise is another promising but unproven treatment.
Hypnosis; likewise, is another promising but unproven treatment.
Hypnosis, likewise, is another promising but unproven treatment.