German farmer Karl Merk, 54, looks at his transplanted arms in a Munich hospital, October 10, 2008. Merk who received the world's first complete double arm transplant is able to perform some basic tasks, but it still could take up to two years until he re-learns how to use his hands properly. Doctors spent 15 hours on July 25-26 grafting the donor arms onto the body of Merk, who lost his own just below the shoulder in a farm accident involving a combine six years ago. REUTERS/Alexandra Beier (GERMANY)

Surgeon Christoph Hoehnke (C) inspects the transplanted arms of 54 year-old German farmer Karl Merk in a Munich hospital, October 10, 2008. Merk, the world's only transplant recipient of two full arms, is able to perform some basic tasks, but it still could take up to two years until he re-learns how to use his hands properly. Doctors spent 15 hours on July 25-26 grafting the donor arms onto the body of Merk, who lost his own just below the shoulder in a farm accident involving a combine six years ago. REUTERS/Alexandra Beier (GERMANY)

German farmer Karl Merk, 54, is pictured reflected in a mirror as he lies in his bed next to a gingerbread heart reading 'Good luck' in a Munich hospital, October 10, 2008. Merk who received the world's first complete double arm transplant is able to perform some basic tasks, but it still could take up to two years until he re-learns how to use his hands properly. Doctors spent 15 hours on July 25-26 grafting the donor arms onto the body of Merk, who lost his own just below the shoulder in a farm accident involving a combine six years ago. REUTERS/Alexandra Beier (GERMANY)

54 year-old German farmer Karl Merk looks at his transplanted arm in a Munich hospital, October 10, 2008. Merk who received the world's first complete double arm transplant is able to perform some basic tasks, but it still could take up to two years until he re-learns how to use his hands properly. Doctors spent 15 hours on July 25-26 grafting the donor arms onto the body of Merk, who lost his own just below the shoulder in a farm accident involving a combine six years ago. REUTERS/Alexandra Beier (GERMANY)

Surgeons Christoph Hoehnke (L) and Manfred Stangl inspect the transplanted arms of 54 year-old German farmer Karl Merk in a Munich hospital, October 10, 2008. Merk, the world's only transplant recipient of two full arms, is able to perform some basic tasks, but it still could take up to two years until he re-learns how to use his hands properly. Doctors spent 15 hours on July 25-26 grafting the donor arms onto the body of Merk, who lost his own just below the shoulder in a farm accident involving a combine six years ago. REUTERS/Alexandra Beier (GERMANY)

German farmer Karl Merk, 54, looks at his transplanted arms as he lies in his bed in a Munich hospital, October 10, 2008. Merk who received the world's first complete double arm transplant is able to perform some basic tasks, but it still could take up to two years until he re-learns how to use his hands properly. Doctors spent 15 hours on July 25-26 grafting the donor arms onto the body of Merk, who lost his own just below the shoulder in a farm accident involving a combine six years ago. REUTERS/Alexandra Beier (GERMANY)

Surgeon Christoph Hoehnke (L) inspects the transplanted arms of 54 year-old German farmer Karl Merk in a Munich hospital, October 10, 2008. Merk, the world's only transplant recipient of two full arms, is able to perform some basic tasks, but it still could take up to two years until he re-learns how to use his hands properly. Doctors spent 15 hours on July 25-26 grafting the donor arms onto the body of Merk, who lost his own just below the shoulder in a farm accident involving a combine six years ago. REUTERS/Alexandra Beier (GERMANY)