Abstract (1133) | Core Tip (1332) | Full Article (HTML) (3275) | Tables (1-4) (301) | Full Article (PDF)-1000K (551) | Received: 03/07/2013 | Revised: 04/04/2013 | Accepted: 04/17/2013 | PubMed Central | PubMed | CrossRef | Google Scholar | Times Cited (7) | Total Visits (8922) | Similar Articles (0) | Timeline of Article Publication (0) | Article Quality Tracking (0) | What about the content of this article? (0) | Cite |  (0) | Open

Abstract (1209) | Core Tip (1031) | Full Article (HTML) (5007) | Full Article (PDF)-540K (583) | Received: 02/20/2013 | Revised: 03/28/2013 | Accepted: 04/29/2013 | PubMed Central | PubMed | CrossRef | Google Scholar | Times Cited (12) | Total Visits (10575) | Similar Articles (205) | Timeline of Article Publication (0) | Article Quality Tracking (0) | What about the content of this article? (0) | Cite |  (0) | Open

Abstract (1078) | Core Tip (998) | Full Article (HTML) (2978) | Tables (1-2) (319) | Full Article (PDF)-720K (344) | Received: 02/14/2013 | Accepted: 04/16/2013 | PubMed Central | PubMed | CrossRef | Google Scholar | Times Cited (9) | Total Visits (7964) | Similar Articles (11) | Timeline of Article Publication (0) | Article Quality Tracking (0) | What about the content of this article? (0) | Cite |  (0) | Open

Abstract (1134) | Core Tip (1062) | Full Article (HTML) (3478) | Figures (1-1) (575) | Tables (1-4) (600) | Full Article (PDF)-770K (359) | Received: 02/21/2013 | Revised: 03/20/2013 | Accepted: 04/10/2013 | PubMed Central | PubMed | CrossRef | Google Scholar | Times Cited (7) | Total Visits (9338) | Similar Articles (5) | Timeline of Article Publication (0) | Article Quality Tracking (0) | What about the content of this article? (0) | Cite |  (0) | Open