Pacient Time Years Gender 2006 55 male 2006 43 female 2006 62 female 2007 58 male 2007 71 male 2007 60 male 2007 79 male 2007 75 female 2007 64 female 2008 66 female 2008 45 male 2008 73 male 2008 61 female 2008 77 female 2009 71 male 2009 53 male 2009 59 male Time: year of the first surgery Years: years old of the patients

Table 1: Dates of patients.