“…If services do not offer a timely appointment, patient circumstances change—they may forget, symptoms resolve, motivations change or other demands emerge, accounting for the almost universal finding that delays lead to missed appointments [ 18 , 27 – 32 , 39 , 40 , 51 , 69 , 90 , 91 , 96 , 119 , 152 ] [ 9 – 11 , 18 , 19 , 27 , 35 , 37 , 40 , 46 , 50 , 51 , 69 , 82 , 100 , 101 , 103 , 109 , 118 , 122 , 137 , 138 , 153 , 154 ]. If services do not offer a convenient time, patients may not be able to reconcile attendance with competing demands or with the rhythms and patterns of their lives [ 9 , 11 , 29 , 32 , 37 , 40 – 42 , 46 , 47 , 49 – 51 , 61 , 66 , 83 , 87 , 96 , 100 , 101 , 106 , 109 , 111 , 113 – 115 , 123 , 128 , 131 , 135 , 155 ]. If the system does not permit or support patie...…”