function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Forel, Marie-Béatrice & Crasquin, Sylvie', 2],
    ['Forel, Marie-Béatrice & Grădinaru, Eugen', 2],
    ['Guillam, Elvis & Forel, Marie-Béatrice & Song, Junjun', 2],
    ['Maillet, Sebastien & Milhau, Bruno & Vreulx, Michel', 6],
    ['Tarnac, Anaëlle & Forel, Marie-Béatrice & Nestell, Galina', 3],
    ['Wannenmacher, Norbert & Dietze, Volker & Franz, Matthias', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);