authors would like to thank the staff, and especially the nurses, of the outpatient apartment of the German Heart Centre for their dedicative support in this project.

This work was supported by the German Research Foundation (DFG) and the Technical University of Munich (TUM) in the framework of the Open Access Publishing Program.

**Funding.** This study is funded by an unrestricted grant from the Robert-Enke-Stiftung and the Fördergemeinschaft Deutsche Kinderherzzentren e.V.

CHD

:   congenital heart disease

cIMT

:   Carotid Intima-media Thickness

HRPF

:   heat-related physical fitness

HRQoL

:   Health related Quality of Life

PWV

:   pulse wave velocity

RCT

:   randomized controlled trial.

[^1]: Edited by: Tim Takken, University Medical Center Utrecht, Netherlands

[^2]: Reviewed by: Shahanawaz Syed, Mahatma Gandhi Mission Institute of Health Sciences, India; Daniel Rossignol, Rossignol Medical Center, Unitedleader of the second phase of the commodities bull market. Cotton was up 54% in 2009 to silver's 48%. In 2010 cotton led the way with a 91% gain as silver was up 83%. On March 7, 2011, cotton was up 51% for the year while silver was up 19% for the year.

Then the inevitable collapse. Cotton went into a 61% bear market in less than 10 months. Silver took the baton and enjoyed its brief tenure as media darling for a couple of months. On April 28, 2011, silver was up 60% for the year. Silver passed the commodity leader baton (i.e., the kiss of death) over to gold and promptly dropped 47% over the next five months.

Let's look at the annual data to see the relationship