function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Al-Khazali, Azhar Mohammed & Kachel, Hamid Saeid', 2],
    ['Barrientos, Jose A. & Prieto, Carlos E. & Pina, Silvia', 1],
    ['Candek, Klemen & Gregoric, Matjaz & Kostanjsek, Rok', 2],
    ['Chatzaki, M.', 11],
    ['Chatzaki, Maria & Keer, Johan Van', 3],
    ['Crespo, Luis C & Domenech, Marc & Enguidanos, Alba', 2],
    ['Deltshev, Christo & Komnenov, Marjan & Blagoev, Gergin', 4],
    ['Fomichev, Alexander A. & Marusik, Yuri M.', 1],
    ['Marjan Komnenov & Eva Pitta & Konstantina Zografou', 3],
    ['Paschetta, Mauro & Christille, Claretta & Marguerettaz, Fabio', 2],
    ['Seropian, Armen & Bulbulashvili, Natalia & Krammer, Hans-Joachim', 1],
    ['Seyyar, O & Ayyildiz, N & Topcu, A', 3],
    ['ZONSTEIN, SERGEI & MARUSIK, YURI M.', 1],
    ['Zamani, Alireza & Chatzaki, Maria & Esyunin, Sergei L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=37)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);