The phrase "are further advised" is correct and usable in written English.
It can be used in formal communication to suggest that someone should take additional action or heed a recommendation.
Example: "All participants are further advised to review the safety guidelines before the event."
Alternatives: "are additionally recommended" or "are encouraged to consider".
I was further advised to begin a rigorous workout program at the local YMCA, where I might meet "interesting people".
"He was further advised to endeavor to report to the camp by latest Monday 7th January 2013 because Wednesday 9th January 2013 was the deadline for submission of the list of 23 players to Caf. "As Andre plans to arrive on Tuesday it means he would be unable to join any of my six training sessions before CAF's Wednesday deadline for the submission of the final squad.
They were further advised to refrain from using deodorants within this timeframe, and to wash their armpits exclusively with an odorless medical soap (Eubos®, Dr. Holbein GmbH, Germany).
They were further advised to entrust their long term assets to two fund managers, instead of one as at present, and to establish an effective investment committee to set out policies for short as well as long term assets as well as oversee external managers.
Prospective follow-up studies are needed to further advise the family members.
Therefore, the ties between Fujian Province and East China are advised to be further strengthened.
They further advised referral to a cardiologist if the results are abnormal.
For Chaplin, Limelight's release was further tainted by the U.S. Immigration and Naturalization Service advising him (as he sailed on an ocean liner with Oona to the film's premiere in London) that he would be denied reentry to the United States unless he was willing to answer charges "of a political nature and of moral turpitude".
Participants noted that treatment for cumulative and toxic exposures should be further researched; doctors do not currently advise prophylactic treatment based on known exposure alone, although symptoms, of course, are treated.
