The Swiss adhesives maker's fight with family shareholders Schenker-Winkler Holding AG over the sale of their stake to France's Saint Gobain continued on Tuesday, with Schenker-Winkler lodging a legal challenge to the re-election of board members including Chairman Paul Haelg. The World Health Organization said the Swiss drugmaker's well-known flu drug Tamiflu may be removed from the global group's "essential medicines list" unless new information supports its use in seasonal and pandemic influenza outbreaks.