Mobile phone follow-up of subjects included in a prospective cohort study: unexpected difficulties.
Pitrou
Isabelle
I
Dauchet
Luc
L
Bailly
Laurent
L
Koubi
Sophie El
SE
Tavolacci
Marie-Pierre
MP
Ladner
Joël
J
D040421:Cell Phone; D003625:Data Collection / Q000379:methods*; D006801:Humans; D011446:Prospective Studies; D013689:Telephone