function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Casanova, Michelle T. & Karol, Kenneth G.', 20],
    ['Info Flora', 24],
    ['Jarvis, Charlie', 3],
    ['Milovanović, Vanja & Popović, Slađana & Predojević, Dragana', 5],
    ['Sanjuan, Josep & Alqudah, Mohammad', 1],
    ['Sanjuan, Josep & Martín-Closas, Carles', 2],
    ['Trabelsi, Khaled & Sames, Benjamin & Wagreich, Michael', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=57)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);