Response to Letters to the Editor from Irit Sinai "Standard Days Method Effectiveness: opinion disguised as scientific review" and Kelsey Wright, Karen Hardee, and John Townsend "The pitfalls of using selective data to represent the effectiveness, relevance and utility of the Standard Days Method of contraception".
Cicely
C
Marston
Department of Population Health, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine.
Kathryn
K
Church
D003267:Contraception; D006801:Humans