Description  Claims  Drawing  Cited references 

WO2012172027A2   [0003]  [0011]  [0012]  [0014]  [0028]  [0032]  [0034]  [0035]  [0035]  [0036]  [0036] 
WO2011139596A2   [0004] 
US8014858B1   [0005] 
US8473051B1   [0006] 
US2004172065A1   [0007]