Heart, lung and circulation
 
Articles in SafetyLit 
 Y-Axis = Volume :: X-Axis = Issue 
?=unknown status :: X=no issue published :: nn=articles from issue :: A=relevant article(s) IDed to add
S=searched, nothing  relevant :: O=issue published but not yet searched :: C=combination issue
|  |  |  |  | 
| 15 (2006) | ? | 1 | ? | 
| 17 (2008) | 1 | 1 | ? | 
| 18 (2009) | 1 | ? | ? | 
| 20 (2011) | ? | ? | 1 |