April 18 (Reuters) - Agility Health Inc AHI.V
* Agility Health announces retirement of CEO
* Says CEO and chairman of the board Steven N. Davidson to retire
* Says Pierre G. Gagnon appointed chairman of the board
* Agility Health Inc - Pierre G. Gagnon will also serve as chief executive officer until a replacement for Davidson has been secured Source text for Eikon: Further company coverage: AHI.V