Adventis, the marketing and advertising firm, has announced it is to close its healthcare division after suffering significant losses.The firm says it has started an "orderly wind down" with 24 staff to be made redundant or redeployed.The winding down process will result in a £1m impairment to goodwill in the full year results.The decision to close the business comes after healthcare provided a significant drag on profits in 2010.Shares in Adventis were down 10% in morning trading as investors absorbed the news.BS