| Name | Info | Provider | Link |
|---|---|---|---|
| subscription/membership/fee required | Elsevier Science | https://linkinghub.elsevier.com/retrieve/pii/S0886-3350(09)00571-9 | |
| subscription/membership/fee required | Ovid Technologies, Inc. | http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=19683161.ui | |
| subscription/membership/fee required | Wolters Kluwer | https://doi.org/10.1016/j.jcrs.2009.04.036 |