Parallel hierarchy of scientific studies in cardiovascular medicine.
Biondi-Zoccai
Giuseppe G
GG
Agostoni
Pierfrancesco
P
Abbate
Antonio
A
D002318:Cardiovascular Diseases; D015510:Clinical Medicine; D002986:Clinical Trials as Topic; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D012107:Research Design; D012586:Science