| Name | Info | Provider | Link |
|---|---|---|---|
| free resource | Medknow Publications and Media Pvt Ltd | http://www.jpgmonline.com/article.asp?issn=0022-3859;year=1997;volume=43;issue=3;spage=73;epage=4;aulast=Chongtham | |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=10740728.ui |