Description  Claims  Drawing  Cited references 

US6616570B2   [0004] 
WO2014023632A1   [0004]  [0011] 
GB2173309A   [0005] 
EP2681984A1   [0005] 
EP2517549A1   [0005]  [0005] 
US20170082442A1   [0006]  [0045] 
EP2803257A1   [0030] 
WO03049532A1   [0030] 
DE102017208442A1   [0036]