NEW YORK — Christine Levinson's husband vanished while on a business trip to Iran. Five months later, she's going there to try to bring him back. The mother of the couple's seven children is planning her own trip to Iran in search of husband Robert Levinson even though she's been advised by the State Department not to travel to Iran because of the risk. "I am positive he is alive," Christine Levinson told The Associated Press in an interview Thursday from her home in Coral Springs, Fla. "If he were hospitalized or had been killed, we would have known by...