Willem Einthoven was a physiologist who discovered the electrical properties of the heart and developed the EKG.
Willem Einthoven was born on May 21, 1860, in Semarang, Java, Indonesia. In 1903, Einthoven devised the first string galvanometer and with it measured the changes of electrical potential caused by contractions of the heart muscle and to record them graphically. He coined the term electrocardiogram (EKG) for this process. Einthoven continued to develop electrode arrangements, and the present-day standard limb leads were originally described and used by him.
Willem Einthoven. (2013). The Biography Channel website. Retrieved 12:46, May 22, 2013, from http://www.biography.com/people/willem-einthoven-9285444.
Willem Einthoven. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/willem-einthoven-9285444 [Accessed 22 May 2013].
"Willem Einthoven." 2013. The Biography Channel website. May 22 2013, 12:46 http://www.biography.com/people/willem-einthoven-9285444.
"Willem Einthoven," The Biography Channel website, 2013, http://www.biography.com/people/willem-einthoven-9285444 [accessed May 22, 2013].
"Willem Einthoven," The Biography Channel website, http://www.biography.com/people/willem-einthoven-9285444 (accessed May 22, 2013).
Willem Einthoven [Internet]. The Biography Channel website; 2013 [cited 2013 May 22] Available from: http://www.biography.com/people/willem-einthoven-9285444.
Willem Einthoven, http://www.biography.com/people/willem-einthoven-9285444 (last visited May 22, 2013).
Willem Einthoven. The Biography Channel website. 2013. Available at: http://www.biography.com/people/willem-einthoven-9285444. Accessed May 22, 2013.