[Sinovac Reports Unaudited Fourth Quarter and Preliminary Full Year 2011 Financial Results - Conference call scheduled for Thursday, March 29, 2012 at 8:00 AM EDT - BEIJING, March 29, 2012 /PRNewswire-Asia/ -- Sinovac Biotech Ltd. (NASDAQ: SVA), a leading provider of biopharmaceutical products in China, announced today its unaudited fourth quarter and preliminary full year financial results for the period] [SINOVAC BIOTECH LTD. No. 39 Shangdi Xi Road Haidian District Beijing 100085, People’s Republic of China Form 20-F x Form 40-F ¨ SINOVAC BIOTECH LTD. 6-K 1 v308765_6k.htm 6-K]