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And he stressed the difficulty in scaling the business — one of the reasons why Groupon has grown from 37 employees in June 2009 to 9,625 as of June 30, 2011.

Analysis showed that exposure to higher levels of PM2.5 led to significant increases in cortisol, cortisone, epinephrine and norepinephrine. Between-treatment differences were also observed for glucose, amino acids, fatty acids and lipids.

Analyzed by broad type of retail outlet in descending order of the provisional estimate of the value of sales, the value of sales of jewelry, watches and clocks, and valuable gifts dropped the most by 2.8 percent in January and February from the same period a year earlier.

Analysts said China may face more growth headwinds in the second half of the year and the authorities will finetune policies to stabilize growth if the situation unexpectedly sours.

André Calantzopoulos, CEO of Launsanne-based PMI, said since tobacco control strategies in most countries focus on supply and demand measures intended to prevent initiation, reduce consumption and encourage cessation, they have resulted in a decline in smoking prevalence over the last three decades, but are unlikely to eliminate smoking altogether.