Effectiveness trials and reviews have already shown mixed but positive results concerning the optional treatment modes: short-term psychotherapy and antidepressant medication if desired.
Colantonio and Smith were concerned that optional use of the Heart would result in some players missing the information it provides, but they considered that it was a part of giving the player the freedom to choose how to play.
Apart from these obligatory documents, there are a number of optional agreements concerning services, such as parcel post and cash on delivery.
In March, however, President Bush withdrew the U.S. from the Vienna Convention's Optional Protocol Concerning the Compulsory Settlement of Disputes and thus rejected ICJ jurisdiction over future domestic death-penalty cases.
DASH is a scoring system that consists of two components: the disability component and an optional module concerning high-performance sport/music and work.
A well-known illustration of this problem concerns so-called optional stopping (Robbins 1952, Roberts 1967, Kadane et al 1996, Mayo 1996, Howson and Urbach 2006).
Complainants must have exhausted all domestic remedies, and anonymous complaints and complaints referring to events which occurred before the country concerned joined the Optional Protocol are not permitted.
In Greece, the first season of the show was broadcast with the rating "Necessary Parental Advice", while the second season is broadcast with the rating "Optional Parental Advice", concerning the official classification of television programs in Greece for the protection of viewers.
The hospital records include detailed information concerning the primary (mandatory) and secondary (optional) discharge diagnoses, procedures, and dates of hospital admission and discharge.
For the Cliso VPs, the obligatory and the optional VPs there was no significant difference concerning the percentage of correct answers (p-values: Cliso=0.684, obligatory VPs=0.300, optional VPs=0.218).
