The quinacrine method of non-surgical female sterilisation involves transcervical intrauterine insertion of 252 mg quinacrine as pellets during the proliferative phase of the menstrual cycle; the drug causes inflammation and fibrosis of the proximal fallopian tube. We have carried out a field trial of 31,781 cases in twenty-four provinces of Vietnam from… (More)
We describe a general decomposition mechanism to express the derivation relation of a word rewriting system R as the composition of a (regular) substitution followed by the derivation relation of a system R ∪ D, where R is a strict subsystem of R and D is the Dyck rewriting system. From this decomposition, we deduce that the system R (resp. R −1) preserves… (More)
OBJECTIVE To determine the long-term efficacy of nonsurgical sterilization with quinacrine. DESIGN Observational cohort study. SETTING Rural provinces in northern Vietnam. PATIENT(S) Two thousand seven hundred and nine women who had quinacrine insertions between 1989 and 1993. INTERVENTION(S) Interviews in 1994, 1995, and 1996 and review of… (More)
We consider standard algorithms of finite graph theory, like for instance shortest path algorithms. We present two general methods to polynomially extend these algorithms to infinite graphs generated by deterministic graph grammars.
OBJECTIVE To determine the long-term safety of nonsurgical sterilization with quinacrine. DESIGN Observational cohort study. SETTING Rural provinces in northern Vietnam. PATIENT(S) Two thousand eight hundred forty women who had had quinacrine insertions and an age-matched comparison group of 1,658 women who had an intrauterine device (IUD) insertion… (More)