Day 4 versus day 3 embryo transfer: a prospective study of clinical outcomes.

Objective: To compare the clinical outcomes after day 4 or day 3 embryo transfers in controlled ovarian hyperstimulation-IVF/intracytoplasmic sperm injection (ICSI) cycles.

Design: Prospective randomized study.

Setting: Center for Human Reproduction, 'Genesis Athens' Clinic (private gynecological and surgical clinic), Athens, Greece.

Laser versus mechanical assisted hatching: a prospective study of clinical outcomes.

Objective: To compare clinical outcomes after laser or mechanical techniques of assisted hatching (AH) in women of advanced age undergoing IVF or intracytoplasmic sperm injection (ICSI).

Design: Prospective randomized study.

Setting: Center for Human Reproduction, Genesis Clinic, Athens, Greece.