Prince Harry prepares to have has his blood taken by Specialist Psychotherapist Robert Palmer for an HIV test at the Burrell Street Sexual Health Clinic in London, Britain on July 14, 2016. REUTERS/Chris Jackson/Pool

Prince Harry chats with Specialist Psychotherapist Robert Palmer in a councelling room as visits Burrell Street Sexual Health Clinic in London, Britain on July 14, 2016. REUTERS/Chris Jackson/Pool

Prince Harry chats with Specialist Psychotherapist Robert Palmer in a councelling room as visits Burrell Street Sexual Health Clinic in London, Britain on July 14, 2016. REUTERS/Chris Jackson/Pool

Psychotherapists and soldiers are seen at Brussels Airport, which partially re-opened following a bomb blast 12 days ago, in Zaventem, Belgium April 3, 2016. REUTERS/Benoit Doppagne/Pool TPX IMAGES OF THE DAY

Medals commemorating the 70th anniversary of the death of Austrian psychiatrist Sigmund Freud, designed by his great-granddaughter British artist Jane McAdam Freud, are displayed in Jablonec nad Nisou January 26, 2010. A founder of psychoanalysis Freud died on September 23rd, 1939. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: SOCIETY) 

Medals commemorating the 70th anniversary of the death of Austrian psychiatrist Sigmund Freud, designed by his great-granddaughter British artist Jane McAdam Freud, are displayed in Jablonec nad Nisou January 26, 2010. A founder of psychoanalysis Freud died on September 23rd, 1939. REUTERS/David W Cerny (CZECH REPUBLIC - Tags: SOCIETY)