US STOCKS-Wall St set to open lower as Greece concerns weigh
* Merkel and Hollande to meet this afternoon
* Greece owes $3.5 bln bond payment to ECB on July 20
* Aetna falls after Humana deal
* Futures down: Dow 152 pts, S&P 16.25 pts, Nasdaq 34.5 pts (Adds details, comment, updates prices)
By Tanya Agrawal
July 6 (Reuters) - U.S. stocks were set to open lower on Monday after Greece rejected debt bailout terms, throwing the future of the country's euro zone membership into further doubt.
World markets fell, but less sharply than expected and analysts attributed the relatively muted reaction to expectations the European Central Bank would act to limit any damage.
A new bailout deal is needed for Greece to meet a July 20 deadline to repay $3.9 billion of bonds to the ECB.
The ECB's governing council began a conference call at 1000 GMT (6 a.m. ET) Monday to decide how long to keep Greek banks afloat. German Chancellor Angela Merkel and French President Francois Hollande will meet in Paris in the afternoon. Continuación...