Question: What is the most common type of screening in volleyball?
About the article "Volleyball", section "Team play".

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Newborn screening programs participate in quality control programs as in any other laboratory, with some notable exceptions.
Much of the success of newborn screening programs is dependent on the filter paper used for the collection of the samples.
Initial studies using Robert Guthrie's test for PKU reported high false positive rates that were attributed to a poorly selected type of filter paper.
This source of variation has been eliminated in most newborn screening programs through standardization of approved sources of filter paper for use in newborn screening programs.
In most regions, the newborn screening card (which contains demographic information as well as attached filter paper for blood collection) is supplied by the organization carrying out the testing, to remove variations from this source. 
Phenotypic screening is a type of screening used in biological research and drug discovery to identify substances such as small molecules, peptides, or RNAi that alter the phenotype of a cell or an organism in a desired manner.  
The most common method of creating screens—amplitude modulation—produces a regular grid of dots that vary in size.
The other method of creating screens—frequency modulation—is used in a process also known as stochastic screening.
Both modulation methods are named by analogy with the use of the terms in telecommunications. 
Mammography is a common screening method, since it is relatively fast and widely available in developed countries.
Mammography is a type of radiography used on the breasts.
It is typically used for two purposes: to aid in the diagnosis of a woman who is experiencing symptoms (called "diagnostic mammography"), and for medical screening of apparently healthy women (called "screening mammography").
Mammography is not very useful in finding breast tumors in dense breast tissue characteristic of women under 40 years.
In women over 50 without dense breasts, breast cancers detected by screening mammography are usually smaller and less aggressive than those detected by patients or doctors as a breast lump.
This is because the most aggressive breast cancers are found in dense breast tissue, which mammograms perform poorly on.
The presumption was that by detecting the cancer in an earlier stage, women will be more likely to be cured by treatment.
This assertion however has been challenged by recent reviews which have found the significance of these net benefits to be lacking for women at average risk of dying from breast cancer. 
Galactose-1-phosphate uridylyltransferase deficiency, also called galactosemia type 1, classic galactosemia or GALT deficiency, is the most common type of galactosemia, an inborn error of galactose metabolism, caused by a deficiency of the enzyme galactose-1-phosphate uridylyltransferase.
It is an autosomal recessive metabolic disorder that can cause liver disease and death if untreated.
Treatment of galactosemia is most successful if initiated early, and includes dietary restriction of lactose intake.
Because early intervention is key, galactosemia is included in newborn screening programs in many areas.
On initial screening, which often involves measuring the concentration of galactose in blood, classic galactosemia may be indistinguishable from other inborn errors of galactose metabolism, including galactokinase deficiency and galactose epimerase deficiency.
Further analysis of metabolites and enzyme activities are needed to identify the specific metabolic error.