2Adams CP,Brantner VV. Estimating the cost of new drug development:is it really $802 million[J]. Health Aff,2006,25(2):420-428.
3DiMasi JA. The value of improving the productivity of the drug development process:faster times and better decisions[J]. Pharmacoeconomies, 2002,20 ( Suppl3 ) : S 1 10.