I did not do EST, but I lost a friend (who tried to recruit me over the course of several years) to the successor to EST, The Landmark Forum. It is essentially the same, but from what I understand they let you take bathroom breaks if you ask once or twice a day. Active in most major cities in the US. This article from Elle is particularly good:
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www.culteducation.com]
The Ross Institutue has a great list of resources:
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www.culteducation.com]
(Thanks Rick)