Are the following sentences punctuated correctly?

The patient’s mother, despite multiple attempts, was unable to be reached.

His unusual contradictory explanation requires a psychiatric workup.

Before we begin surgery he needs to be seen by the anesthesia service.

1 answer

Sentence one is awkward, but correctly punctuated.

Sentences two and three are incorrect.
http://grammar.ccc.commnet.edu/grammar/commas.htm
See #s 3 and 5.