A letter to the editor on the article by Burri et al.
Jannini
Emmanuele A
EA
School of Sexology, University of L'Aquila, Rome, Italy; Centre d'échographie, Saint Germain en Laye, France; Hôpital de Saint Germain en Laye, Saint Germain en Laye, France; Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.
Gravina
Giovanni Luca
GL
School of Sexology, University of L'Aquila, Rome, Italy; Centre d'échographie, Saint Germain en Laye, France; Hôpital de Saint Germain en Laye, Saint Germain en Laye, France; Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.
Buisson
Odile
O
School of Sexology, University of L'Aquila, Rome, Italy; Centre d'échographie, Saint Germain en Laye, France; Hôpital de Saint Germain en Laye, Saint Germain en Laye, France; Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.
Foldès
Pierre
P
School of Sexology, University of L'Aquila, Rome, Italy; Centre d'échographie, Saint Germain en Laye, France; Hôpital de Saint Germain en Laye, Saint Germain en Laye, France; Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.
Burri
Andrea Virginia
AV
School of Sexology, University of L'Aquila, Rome, Italy; Centre d'échographie, Saint Germain en Laye, France; Hôpital de Saint Germain en Laye, Saint Germain en Laye, France; Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.
Cherkas
Lynn
L
School of Sexology, University of L'Aquila, Rome, Italy; Centre d'échographie, Saint Germain en Laye, France; Hôpital de Saint Germain en Laye, Saint Germain en Laye, France; Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.
Spector
Timothy D
TD
School of Sexology, University of L'Aquila, Rome, Italy; Centre d'échographie, Saint Germain en Laye, France; Hôpital de Saint Germain en Laye, Saint Germain en Laye, France; Department of Twin Research and Genetic Epidemiology, King's College London, London, UK.