Global HRT sales , which are dominated by Wyeth of the US , were worth $ 3.8bn in 2001 , according to Data- monitor , the London-based market research company .
Global HRT sales were worth $ 3.8bn ( 2.4bn ) in 2001 , according to Datamonitor , the London-based market research company .
Some conservative groups have staunchly opposed such programs , saying they send the wrong message and in effect encourage and enable teens to have sex before marriage .