TY - JOUR AU - Singh, S; Sedgh, G; Hussain, R TI - Unintended pregnancy: worldwide levels, trends, and outcomes JO - Stud Fam Plann IS - 4 VL - 41 PY - 2010 DO - 10.1111/j.1728-4465.2010.00250.x SP - 241 EP - 250 ER -