S Mishra, S Bhatnagar, D Gupta, Gaurav Nirvani Goyal, R Jain and H. Chauhan
American Journal of Hospice and Palliative Medicine 26 ( 3 ): 159 - 164 , 2009
A Agarwal, D Gupta, G Yadav, P Goyal, P. K Singh and U. Singh
Anesthesia & Analgesia 109 ( 1 ): 77 - 81 , 2009
S. P Ambesh, N Singh, D Gupta, P. K Singh and U. Singh
BJA: British Journal of Anaesthesia 104 ( 1 ): 40 - 43 , 2010