It's never easy to figure out Wall Street, where bad news can be good for stocks or vice versa. Sometimes a stock can be flying high, only to have a well-known analyst spoil the party with a downgrade. The reverse also is true, as was the case this week with some healthcare real estate investment trusts (REITs). Over the past three trading days, healthcare REITs have been the worst-performing REIT subsector. Six healthcare REITs lost between 4% and 11.5%. Eleven more healthcare REITs are also in