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7.

Randomised trials of HIV prevention
by Gray, Ronald H

The Lancet (British edition), 2007, Vol.370 (9583), p.200-201

11.

Male Circumcision for HR-HPV Prevention
by Tobian, Aaron A. R Aaron A. R

The Lancet (British edition), 2011-07-23, Vol.378 (9788), p.314-315

16.

Epidemiological and clinical
by Gray, Ronald H

The Lancet (British edition), 2001-10, Vol.358 (9288), p.1173

17.

Uses of error: Epidemiological and clinical
by Gray, Ronald H

The Lancet (British edition), 2001-10-06, Vol.358 (9288), p.1173

19.

Risk of ovulation during lactation
by Gray, R.H

The Lancet (British edition), 1990, Vol.335 (8680), p.25-29

12

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