This goal is achieved by systematically addressing and, when possible, minimising or eliminating identifiable threats to external validity.
When possible, address the source of the stress.
*16 letters or FIT kits were returned, when possible, addresses were updated or patients were called and re-sent a FIT kit.
When possible, each address was geocoded to a specific parcel.
These studies should use appropriate animals, when possible, and address potential relevant confounding effects, for instance, age, gender, chronic disease, burn, inflammation, wounding, and partial-body exposure.
When possible, email addresses or telephone numbers of contact persons are indicated.
Both Mr. Meyerson and Mr. Ruotolo agreed that charitable organizations needed to remind loyal donors that their causes still existed and needed money and when possible, groups should address the issue of 9/11.
At enrollment, participants from the ER and CR groups gave their name, mail and e-mail addresses, phone number (if available) and when possible, two additional phone contacts.
Vagueness (e.g. the meaning of "likely") can be addressed by providing clear definitions, and, when possible, numerical orderings that relate to the vague statements.
The investigators also did manual corrections when possible; these involved comparing the URL address in our database with the address in the MEDLINE title or abstract.
When possible, we manually located all addresses that could not be automatically matched using the GIS.
