function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dursun, Ahmet & Fent, Meral', 1],
    ['Ghahari, Hassan & Chérot, Frédéric', 4],
    ['Inés, Olivo Verónica & Coscarón, Maria Del Carmen', 1],
    ['Jung, Sunghoon & Kim, Junggon & Oh, Sumin & Heiss, Ernst', 1],
    ['Konstantinov, Fedor V. & Namyatova, Anna A.', 3],
    ['Linnavuori, Rauno E.', 3],
    ['Norbiato, Margherita & Dioli, Paride & Cianferoni, Fabio', 2],
    ['Sakenin, H. & Samin, N. & Rastegari, J. & Havaskary, M.', 1],
    ['Samin, Najmeh & E, Rauno', 1],
    ['TASZAKOWSK, Artur & PASIŃSKA, Agnieszka', 1],
    ['Tatarnic, Nikolai J. & Cassis, Gerasimos', 1],
    ['Usinger, Robert L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);