It isn't illegal to chew gum, but it is illegal to bring them into Singapore or sell them except for medical purposes. Since you can't buy gum (selling is illegal) there's no way to chew them so it's almost as good as not being able to chew gum. See this: http://www.customs.gov.sg/leftNa...
Definition: In Vitro. A study done in vitro, in contrast, looks at how a drug or procedure responds in the confines of a test tube or laboratory dish. Clinical trials or medical studies may be performed either in vivo or in vitro.
In vitro fertilization procedure cancelled before. aspiration, case rate. Z31.83 - Encounter for assisted reproductive fertility. procedure cycle. ï· Patient undergoing in vitro fertilization cycle. ï· Use additional code to identify the type of. infertility. Excludes pre-cycle diagnosis and testing - code to reason. for encounter.