Complete list of investigators who participated in the study.

E Albengres (Paris Creteil), P Allain (Angers), H Allain (Rennes), M Amaniou (Limoges), M Andrejak (Amiens), E Autret-Leca (Tours), B Baldin (Nice), C Barjhoux (Grenoble), F Bavoux (Paris Saint Vincent de Paul), P Bechtel (Besançon), B Bellemin (Lyon), A Blain (Nancy), JP Blayac (Montpellier), M Biour (Paris Saint Antoine), J Caron (Lille), RM Chichmanian (Nice), A Chiffoleau (Nantes), M David-Laroche (Besançon), S Djezzar (Paris F Widal), A Eschalier (Clermont Ferrand), A Escousse (Dijon), I Fabre (Brest), C Gallant (Lyon), D Gambini (Marseille), S Gautier (Lille), ML Germain (Reims), P Gillet (Nancy), S Ginisty (Paris F Widal), V Gras (Amiens), C Guihard (Brest), C Guy (Saint Etienne), F Haramburu (Bordeaux), D Hillaire-Buys (Montpellier), JL Imbs (Strasbourg), M Jasson (Paris Pitié Salpétrière), MJ Jean-Pastor (Marseille), AP Jonville-Bera (Tours), J Jouglard (Marseille), C Kreft-Jais (Paris Broussais), J Lacotte (Caen), L Lagarde (Angers), JD Lamaison (Clermont Ferrand), P Lainé-Cessac (Angers), C Larousse (Nantes), F Le Doze (Caen), H Le Louet (Paris Creteil), A Lillo-Le Louet (Paris Broussais), ME Llau (Toulouse), C Loubeyre-Unique (Paris Saint Vincent de Paul), M Mallaret (Grenoble), L Merle (Limoges), J Michot (Paris Saint Antoine), G Miremont (Bordeaux), S Mocine (Paris Saint Antoine), JL Montastruc (Toulouse), B Mosquet (Caen), M Moulin (Caen), C Noblet (Rouen), Y Nouaille (Limoges), P Netter (Nancy), M Ollagnier (Saint Etienne), N Parchin-Geneste (Dijon), C Penfornis (Rennes), E Pohier (Bordeaux), P Pouyanne (Bordeaux), MC Perault (Poitiers), H Peyrière (Montpellier), V Pras (Paris Saint Antoine), M Radal (Tours), C Remblier-Dejean (Poitiers), M Ratrema (Saint Etienne), L Richard (Nantes), C Riché (Brest), F Rodor (Marseille), L Sauvé (Amiens), C Sgro (Dijon), C Soubrié (Paris Pitié Salpétrière), A Spreux (Nice), S Tanasescu (Rouen), L Thomas (Paris F Widal), C Thulliez (Rouen), P Tréchot (Nancy), T Trenque (Reims), B Vandel (Poitiers), C Vauzelle-Gardier (Paris Saint Vincent de Paul), T Vial (Lyon), C Villier (Grenoble), M Welsch (Strasbourg), and M Zenut (Clermont Ferrand).